394:(DMF) solvent molecules were observed in the smaller triangular channels of as-prepared MIL-68(In) reported by Volkringer et. al, disordered over two positions, with hydrogen bonding between the oxygen of the DMF and the hydroxyl group of the inorganic chain. The solvent was removed by calcination at 200 °C overnight in a furnace. The activated samples were stored under inert atmosphere to prevent rehydration which would lead to hydrolysis and ultimately decomposition of the structure. Adsorption studies on the indium and gallium forms of MIL-68 give a value for the BET surface area of 1117(24) m2 g-1,746(31) mg and 603(22) mg for the gallium, indium and vanadium forms respectively. A number of activation procedures were attempted and NMR analysis used to verify complete removal of guest molecules to obtain the surface area results. The BET values suggest that the indium and vanadium analogues were not fully activated prior to adsorption. Notably, a recent computational study of the theoretical surface area, gave a value of 3333 mg for MIL-68(V) suggesting that there may still be activation issues with all the MIL-68 derivatives, rendering some of the porosity in accessible.
297:) as the formula for the activated material. The activated MIL-47(V) is anhydrous at room temperature under ambient pressure, as the channels are hydrophobic, being lined with phenyl rings and with no accessible metal sites or favourable hydrogen bonding positions the channels are hydrophobic. MIL-53 was first reported with chromium (Cr3+) and shortly after with aluminium (Al3) with terephthalic acid as the linker. MIL-53 is isostructural with MIL-47, the main difference is that MIL-53 only contains the trivalent metal and a μ2-hydroxide bridge whereas the activated MIL-47 is the tetravalent V with μ2-oxobridging. As the activated form of the MIL-53 contains the metal hydroxide chains, the channels are hydrophilic with the hydroxide protons available for hydrogen bonding. When activated MIL-53(Cr or Al) is exposed to moisture,
319:
345:
203:’ based MOF where two copper ions form a dimeric unit with four bridging carboxylates creating a square planar geometry around two adjacent copper sites. The two copper ions in the paddlewheel coordinate to the oxygen of two water molecules to create a double square pyramidal geometry for the two metal sites in the hydrated form of the structure. Activation of the material prior to adsorption studies results in the removal of the terminal water molecules resulting in a coordinatively unsaturated metal site. The rigid, porous structure of the HKUST-1 framework combined with the accessibility of the activated metal sites upon dehydration has led to a lot of interest in adsorption, separation and catalysis applications.
122:
332:
236:
cations with little freedom to rotate or distort the chain to change the coordination environment. This unfavourable coordination environment means that the activated metal site has a high enthalpy of adsorption and is readily filled by adsorbed guest species. The chain is topologically identical to that of the nickel bisphosphonate STA-12(Ni) but differs upon dehydration where the additional flexibility of the bisphosphonate linker allows the chain to twist and distort reducing the accessibility of the coordinatively unsaturated metal site. The availability of this metal site in the CPO-27 framework has been explored for a number of different adsorption applications involving gases such as CO
432:
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225:) was reported by Dietzel and co-workers, while at a similar time work by Rosi et. al. produced the isostructural zinc analogue, referred to as MOF-74. The divalent metal and 2,5-dihydroxyterephthalic acid linker form a honeycomb like array of hexagonal channels. The inorganic component is a helical chain of edge sharing NiO6octahedra where each metal is bound to two oxygens from hydroxyl groups on the ligand, three oxygens from carboxylate groups and one water molecule.
169:
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contraction of the unit cell volume is, however, much greater than that observed in MIL-53. As the trimeric units are connected in three dimensions, rather than the columnar rows of terephthalates connecting the chains in MIL-53, the change occurs over all three axes resulting in a cell volume expansion for the terephthalate form (MIL-88B) of 125% from the fully dried form (1500 Å3) to the most open form observed upon methanol solvation (3375Å3).
107:). This large yet rigid tri-carboxylate unit connects to the cluster in the same manner as in the MOF-5 structure but as there are three carboxylate units and a triangular geometry, this produces a more spherical porous cage structure rather than the cubic pore geometry in MOF-5. MOF-177 has been shown to have one of the largest surface areas of known materials to date. Literature states a Langmuir surface area value of 4500 mg with N
138:
265:, first reported by Barthelet and co-workers, is an example of a metal organic framework consisting of infinite corner sharing metal chains of VO6 octahedra bridged by the linear terephthalate organic linker. This connectivity results in the formation of large diamond shaped channels. The channels in as-prepared vanadium MIL-47 contain some residual guest terephthalic acid and is reported as having the formula V(OH)(CO
407:
of dicarboxylate forming the same network topology prepared using the fumaric acid (MIL-88A), terephthalic acid (-88B),naphthalene-2,6-dicarboxylic acid (-88C) and 4,4’-biphenyldicarboxylic acid (-88D). The framework consists of both one dimensional channels, and trigonal bipyramidal cages. Solvent exchange experiments on the terephthalate form, MIL-88B, show that large organic molecules such as
364:
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387:) initially reported for V3+and later with In and Ga. In this case the metal hydroxide chains connect to form two types of unidirectional channels, triangular and hexagonal in shape, creating a‘kagome lattice’ like network of pore channels. The cross-sectional diameters of the triangular and hexagonal channels are 6 Å and 17 Å respectively.
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MIL-88(Cr and Fe) also exhibits a breathing behaviour in response to solvent exchange and gas adsorption. The mechanism for the breathing is similar to that observed in the MIL-53 where there is a hinge like motion around the axis of the two oxygen atoms of the carboxylate. The observed expansion and
77:
O inorganic clusters connected by terephthalate linkers. Each cluster involves 6 carboxylate groups of 6 terephthalate molecules bridging zinc atoms leading to an octahedral type arrangement around the cluster which, when expanded in three dimensions, reproduces the cubic arrangement of the material.
415:
are able to enter the framework and induce an increase in cell volume over the dried material. The three metals in the trimeric cluster share a μ3-O and are bridged to the adjacent metals with four carboxylate groups, leaving a coordinatively unsaturated metal site pointing into the cages within the
406:
Reactions using the metal acetate trimeric building unit are thought to proceed via a ligand exchange mechanism where the acetate of the starting material is replaced with a longer linear dicarboxylate to create the three dimensional framework. MIL-88 is an isoreticular series with increasing length
235:
of CPO-27(Ni) are separated by the planar dihydroxyterephthalic acid linker. This organic molecule acts as a rigid pillar between chains with each linker bound to three different metal sites from each chain. Removal of the solvent molecules from the terminal metal sites creates five-coordinate metal
402:
Further study on the metal carboxylate systems of trivalent iron and chromium yielded a series of materials referred to as MIL-88(A-D). First reported as an iron fumarate, and based on the trimeric building unit obtained on the crystallization of iron (and chromium) acetate, MIL-88 is a family of
61:
are examples of prototypical MOF materials and triggered a huge growth in the field of metal-organic frameworks. A keyword search for “metal-organic frameworks” registers>1,600 publications in 2010 and >2,000 for 2011, a strong indication of the worldwide interest in this area and indicates
304:
As a result of this hydration behavior, the unit cell volume reduces by ~30%, fully reversible upon subsequent dehydration. Such large structural changes, in response to adsorption of gas or solvent molecules, is commonly referred to as ‘breathing’. Since the initial reports of the chromium and
416:
framework. To maintain charge balance in the material, there must be one negatively charged species on the cluster, either a hydroxide or fluoride (depending on the synthesis conditions) occupying one of the unsaturated metal sites and the other two could be water or exchanged solvent species.
86:
and at the time, among the highest of all known materials. One downside to the large open pore structure is the potential for interpenetration of 2 frameworks. In the case of MOF-5 and the IRMOF family of isoreticular structures, if the pore size is sufficient to contain a
62:
that the growth is continuing. More recent work on divalent carboxylates with longer and more complex organic components is pushing the limits of gas adsorption and storage properties with the highest surface areas and lowest densities of all known crystalline materials.
215:
Single chain (left) and view along the hexagonal channels (right) of the nickel dihydroxyterephthalate, CPO-27(Ni). Nickel octahedra are shown in green, black spheres represent the carbon atoms of the organic linker and red spheres the oxygen of adsorbed water
252:
Some of the most widely studied of all metal organic frameworks are trivalent metal carboxylate materials. Extensive work in this area has provided an understanding of the crystal chemistry of a wide variety of the trivalent first row transition metals
281:) and a hydroxide μ2-OH ion forming the infinite chains. Activation of the solid by heating in a tube furnace at 573 K for 24 hours results in deprotonation of the hydroxide on the chains to form a μ2-oxo and oxidation of the vanadium, to give VO(CO
220:
While surface area and pore volume is important to the adsorption properties of MOF materials, another consideration is the availability of coordinatively unsaturated metals sites. The divalent metal carboxylate CPO-27(M) (where M =
111:
adsorption giving a type I isotherm with adsorption of 1350 mg g-1 between 0.4 and 1 P/P0.50 These values show that MOF-177 is a highly porous open framework MOF material with a 3-dimensionally connected array of porous cages.
95:
of two frameworks results in a significant reduction in the porosity as the majority of the void space in the cage is filled with the other framework. Examples of interpenetration are reported for some members of the IRMOF series.
192:‘paddlewheel’ cluster coordinated by trimesic acid (left) and the porous cubic framework (right) of HKUST-1. Blue polyhedra represent the square pyramidal CuO5. Black spheres represent the carbon atoms of the organic linker.
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Corner sharing vanadium chains (left) and view along the rhombic channels (right) of the vanadium terephthalate, MIL-47(V).62 Vanadium octahedra are shown in red, black spheres represent the carbon atoms of the organic
1197:"V III (OH){O 2 C–C 6 H 4 –CO 2 }.(HO 2 C–C 6 H 4 –CO 2 H)x(DMF) y (H 2 O)z (or MIL-68), a new vanadocarboxylate with a large pore hybrid topology : reticular synthesis with infinite inorganic building blocks?"
131:
O(CO2)6 cluster (left), octahedral geometry of terephthalate molecules (middle) and 3D cubic lattice (right). Zinc tetrahedra are shown in blue. Black spheres represent the carbon atoms of the organic linker.
350:
MIL-53(Cr) in the hydrated (narrow pore) state (left) and in the dehydrated (large pore) state (right). Chromium octahedra are shown in green, black spheres represent the carbon atoms of the organic linker.
337:
Corner sharing chromium hydroxide chains (left) and large pore (dehydrated) framework of MIL-53(Cr) (right). Chromium octahedra are shown in green, black spheres represent the carbon atoms of the organic
1238:
Volkringer, Christophe; Meddouri, Mohamed; Loiseau, Thierry; Guillou, Nathalie; Marrot, Jérôme; Férey, Gérard; Haouas, Mohamed; Taulelle, Francis; Audebrand, Nathalie; Latroche, Michel (2008-12-15).
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Work by
Barthelet and co-workers also identified MIL-68, another trivalent metal terephthalate. The framework is a polymorph of the MIL-47/MIL-53 structure with the chemical formula, MIIIOH(CO
437:
Iron trimer unit with bridging trifluoroacetate anions. Iron octahedra are shown in brown, black and green spheres represent the carbon and fluorine atoms of the organic linker respectively.
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Corner sharing vanadium chains (left) and large pore framework of MIL-68(V) (right). 64 Vanadium octahedra are shown in red, black spheres represent the carbon atoms of the organic linker.
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shows the material adopts a ‘closed’ structure, due to the strong hydrogen bonding interaction between the hydroxyl groups of the inorganic chains and the adsorbed water molecules.
1240:"The Kagomé Topology of the Gallium and Indium Metal-Organic Framework Types with a MIL-68 Structure: Synthesis, XRD, Solid-State NMR Characterizations, and Hydrogen Adsorption"
1420:
1100:"Very Large Breathing Effect in the First Nanoporous Chromium(III)-Based Solids: MIL-53 or Cr III (OH)·{O 2 C−C 6 H 4 −CO 2 }·{HO 2 C−C 6 H 4 −CO 2 H} x ·H 2 O y"
746:
Vitillo, Jenny G.; Regli, Laura; Chavan, Sachin; Ricchiardi, Gabriele; Spoto, Giuseppe; Dietzel, Pascal D. C.; Bordiga, Silvia; Zecchina, Adriano (2008-07-01).
91:
O cluster and the dicarboxylate is of sufficient length, then the formation of a second extended lattice can occur within the first. This interpenetration or
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Prestipino, C.; Regli, L.; Vitillo, J. G.; Bonino, F.; Damin, A.; Lamberti, C.; Zecchina, A.; Solari, P. L.; Kongshaug, K. O.; Bordiga, S. (2006-03-01).
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Chavan, Sachin; Bonino, Francesca; Vitillo, Jenny G.; Groppo, Elena; Lamberti, Carlo; Dietzel, Pascal D. C.; Zecchina, Adriano; Bordiga, Silvia (2009).
709:"Local Structure of Framework Cu(II) in HKUST-1 Metallorganic Framework: Spectroscopic Characterization upon Activation and Interaction with Adsorbates"
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Loiseau, Thierry; Serre, Christian; Huguenard, Clarisse; Fink, Gerhard; Taulelle, Francis; Henry, Marc; Bataille, Thierry; Férey, Gérard (2004-03-19).
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McKinlay, Alistair C.; Morris, Russell E.; Horcajada, Patricia; Férey, Gérard; Gref, Ruxandra; Couvreur, Patrick; Serre, Christian (2010-08-23).
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is an early and heavily studied example of a MOF material. The material is an example of a cubic 3-dimensional extended lattice composed of Zn
103:
O cluster but with a more complex and extended tricarboxylate linker. The carboxylate molecule in this case in the large BTB molecule (BTB =
137:
839:"Structural Changes and Coordinatively Unsaturated Metal Atoms on Dehydration of Honeycomb Analogous Microporous Metal–Organic Frameworks"
795:"Synthesis, structural properties, and catalytic behavior of Cu-BTC and mixed-linker Cu-BTC-PyDC in the oxidation of benzene derivatives"
1098:
Serre, Christian; Millange, Franck; Thouvenot, Christelle; Noguès, Marc; Marsolier, Gérard; Louër, Daniel; Férey, Gérard (2002-11-01).
1061:<291::aid-ange291>3.0.co;2-i "A Breathing Hybrid Organic-Inorganic Solid with Very Large Pores and High Magnetic Characteristics"
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MOF-74 was prepared using DMF as the solvent and as such, has terminal DMF molecules bound to the free metal sites on the chain.
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928:"Interaction of hydrogen with accessible metal sites in the metal–organic frameworks M2(dhtp) (CPO-27-M; M = Ni, Co, Mg)"
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31:
82:(a monolayer-equivalent surface area) is stated to be of the order of 3000 mg, significantly higher than that of most
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MIL-88(Fe or Cr) series with the fumarate, terephthalate, naphthalate and biphenyldicarboxylate linkers respectively.
199:
is another early example of a divalent carboxylate MOF. Reported around the same time as MOF-5, HKUST-1 is a copper ‘
926:
Dietzel, Pascal D. C.; Georgiev, Peter A.; Eckert, Juergen; Blom, Richard; Strässle, Thierry; Unruh, Tobias (2010).
1287:"A Route to the Synthesis of Trivalent Transition-Metal Porous Carboxylates with Trimeric Secondary Building Units"
879:
Rosi, Nathaniel L.; Kim, Jaheon; Eddaoudi, Mohamed; Chen, Banglin; O'Keeffe, Michael; Yaghi, Omar M. (2005-02-01).
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Chui, Stephen S.-Y.; Lo, Samuel M.-F.; Charmant, Jonathan P. H.; Orpen, A. Guy; Williams, Ian D. (1999-02-19).
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Serre, C.; Mellot-Draznieks, C.; Surblé, S.; Audebrand, N.; Filinchuk, Y.; Férey, G. (2007-03-30).
1150:"A Rationale for the Large Breathing of the Porous Aluminum Terephthalate (MIL-53) Upon Hydration"
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881:"Rod Packings and Metal−Organic Frameworks Constructed from Rod-Shaped Secondary Building Units"
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506:"Design and synthesis of an exceptionally stable and highly porous metal-organic framework"
1331:"Role of Solvent-Host Interactions That Lead to Very Large Swelling of Hybrid Frameworks"
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IRMOF-13 (left) and IRMOF-15 (right): Interpenetration of the low density cubic lattices.
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Dietzel, Pascal D. C.; Johnsen, Rune E.; Blom, Richard; Fjellvåg, Helmer (2008-03-07).
662:"A Chemically Functionalizable Nanoporous Material [Cu 3 (TMA) 2 (H 2 O) 3 ] n"
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aluminium MIL-53, extensive work has been undertaken in this area, and the range of
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The structure is retained upon solvent removal and the literature states that the
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Serre, Christian; Millange, Franck; Surblé, Suzy; Férey, Gérard (2004-11-26).
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Barthelet, Karin; Marrot, Jérôme; Riou, Didier; Férey, Gérard (2002-01-18).
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Li, Hailian; Eddaoudi, Mohamed; O'Keeffe, M.; Yaghi, O. M. (November 1999).
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1022:"BioMOFs: Metal-Organic Frameworks for Biological and Medical Applications"
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MOF-177 is another example of a MOF material containing the tetrahedral Zn
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10.1002/1521-3757(20020118)114:2<291::aid-ange291>3.0.co;2-i
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Marx, Stefan; Kleist, Wolfgang; Baiker, Alfons (2011-07-01).
613:"Strategies for Hydrogen Storage in Metal-Organic Frameworks"
566:"Metal–organic frameworks: a new class of porous materials"
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isoreticular materials prepared withdicarboxylate linkers.
748:"Role of Exposed Metal Sites in Hydrogen Storage in MOFs"
1195:
Barthelet, K.; Marrot, J.; Férey, G.; Riou, D. (2004).
484: by John Patrick Stephen Mowat available under the
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materials now extends to: Cr,Al, Fe, Ga, In, and Sc.
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611:Rowsell, Jesse L. C.; Yaghi, Omar M. (2005-07-25).
564:Rowsell, Jesse L. C.; Yaghi, Omar M. (2004-08-06).
53:The divalent metal carboxylate based frameworks
975:"Response of CPO-27-Ni towards CO, N2 and C2H4"
143:MOF-177, single cage from the zinc carboxylate.
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8:
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28:Carboxylate–based metal–organic frameworks
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1104:Journal of the American Chemical Society
885:Journal of the American Chemical Society
752:Journal of the American Chemical Society
1291:Angewandte Chemie International Edition
1026:Angewandte Chemie International Edition
617:Angewandte Chemie International Edition
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570:Microporous and Mesoporous Materials
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979:Physical Chemistry Chemical Physics
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572:. Metal-Organic Open Frameworks.
461:Open and closed MIL-88(Fe or Cr).
480: This article incorporates
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1553:Zeolitic imidazolate frameworks
582:10.1016/j.micromeso.2004.03.034
1154:Chemistry - A European Journal
843:Chemistry - A European Journal
1:
678:10.1126/science.283.5405.1148
105:benzene-1,3,5-tribenzoic acid
261:The vanadium terephthalate
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811:10.1016/j.jcat.2011.04.004
1576:Metal-organic frameworks
1412:Metal–organic frameworks
32:metal–organic frameworks
1347:10.1126/science.1137975
932:Chemical Communications
1421:Carboxylate–based MOFs
1303:10.1002/anie.200454250
1166:10.1002/chem.200305413
1038:10.1002/anie.201000048
855:10.1002/chem.200701370
713:Chemistry of Materials
630:10.1002/anie.200462786
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248:Trivalent Carboxylates
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18:Carboxylate-based MOFs
1539:Molybdenum-based MOFs
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80:Langmuir surface area
49:Divalent Carboxylates
1498:Aluminium-based MOFs
1447:Zirconium-based MOFs
799:Journal of Catalysis
1525:Vanadium-based MOFs
1341:(5820): 1828–1831.
1250:(24): 11892–11901.
1244:Inorganic Chemistry
1110:(45): 13519–13526.
672:(5405): 1148–1150.
257:MIL-47 & MIL-53
66:MOF-5 & MOF-177
1513:Azolate-based MOFs
944:10.1039/c0cc00091d
392:-Dimethylformamide
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127:MOF-5 assembly, Zn
34:that are based on
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1462:Nickel-based MOFs
1297:(46): 6285–6289.
1256:10.1021/ic801624v
1116:10.1021/ja0276974
1065:Angewandte Chemie
1032:(36): 6260–6266.
985:(42): 9811–9822.
938:(27): 4962–4964.
897:10.1021/ja045123o
764:10.1021/ja8007159
758:(26): 8386–8396.
725:10.1021/cm052191g
623:(30): 4670–4679.
516:(6759): 276–279.
299:X-ray diffraction
43:functional groups
36:organic molecules
16:(Redirected from
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38:comprising
470:References
216:molecules.
93:catenation
1481:Ni(2-ain)
1474:Ni(3-ain)
1355:0036-8075
1264:0020-1669
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1174:0947-6539
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488:license.
409:lutidine
244:and NO.
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666:Science
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338:linker.
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