Knowledge (XXG)

NMR tube

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When the NMR tube is determined to be clean, it is triple-rinsed with distilled water and left to air-dry or dry in an oven at low temperature. It is best not to exceed 60 Â°C. At higher temperatures, slight tube distortion can occur which will affect tube camber. If NMR tubes are washed, a final
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experiments, where only a smaller sample is available. A corresponding smaller solvent volume is desired to maintain a higher sample concentration. The reduced sample depth is compensated for by solid glass on the NMR tube beneath the level of sample, which varies for the make of spectrometer. Once
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Two common specifications for NMR tubes are concentricity and camber. Concentricity refers to the variation in the radial centers, measured at the inner and outer walls. Camber refers to the "straightness" of the tube. Poor values for either may cause poorer quality spectra by reducing the
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NMR is desired, quartz NMR tubes containing low concentrations of boron (as opposed to borosilicate glass) are available. Specialized closures such as J. Young valves and screwcap closures are available aside from more common polyethylene caps.
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homogeneity of the sample. In particular, an NMR tube which has poor camber may wobble when rotated, giving rise to spinning side bands. With modern manufacturing techniques even cheap tubes give good spectra for routine applications.
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A better alternative to the use of potentially hazardous oxidizers is an NMR tube cleaner (right). It is an apparatus which uses a vacuum to flush solvent and/or a detergent solution through the entire length of the NMR tube.
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Teflon tap used to seal NMR tubes for air-sensitive samples – has a central bore starting at the top of the tap, which splits into a T-junction at the bottom. One of the openings of the inverted "T" can be seen in this
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This sort of apparatus is commercially available, though it is costly and easy to destroy by shattering or breaking off the cleaning tube. Equivalent designs may be assembled from ordinary labware as well.
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air bubbles have been expelled, the plunger is secured to the tube proper by parafilm. Ideally, the tubes are matched with the deuterated solvent used to have better spectrum resolution.
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are good choices because dichloromethane is similar in polarity to chloroform, a common NMR solvent, while acetone dissolves many organic compounds. Sonication and scrubbing with a
152: 50:. They are available in seven and eight inch lengths; a 5 mm tube outer diameter is most common, but 3 mm and 10 mm outer diameters are available as well. Where 164: 270:). Care should be taken with these solutions, as they can unexpectedly and violently erupt from the NMR tube due to pressure build-up (aqua regia) or explosion (piranha). 146:
Plunger/insert centre, left 8 mm "bottom length" outer tube suitable for Bruker and Varian NMR spectrometers, right 15 mm outer tube suitable for Varian only
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A J. Young NMR tube attached to an adapter with a female 24/40 joint already greased. Note the hole resulting from the T-bore in the side of the PTFE plug.
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rinse is recommended with a solvent that easily evaporates at 60 Â°C and that has no residue such as methanol. Avoid acetone, which leaves a residue.
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Usually, only a small sample is dissolved in an appropriate solvent. For H NMR experiments, this will usually be a deuterated solvent such as CDCl
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may be helpful in removing traces of solid contaminants. If necessary, the tube may be filled with an oxidizing solution of
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Cleaning is performed usually by rinsing with the same (non-deuterated) solvent used to dissolve the initial sample.
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The sample may be sonicated or agitated to aid dissolution, and solids are removed via filtering through a plug of
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fixed to the base of the NMR tube), is placed upside down on the apparatus. The NMR tube fits over an inner tube
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with solvent cleaning it. Note to complete the vacuum a flask is attached to the NMR tube cleaning apparatus.
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The NMR tube is then usually sealed with a polyethylene cap, but can be flame sealed or sealed with a Teflon '
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NMR tubes are hard to clean because of their small bore. They are cleaned best before the sample has dried.
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is a microscale NMR tube used with an ordinary-size NMR tube. Shigemi tubes may be appropriate for
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An NMR tube filled with a colorless sample, sealed with a green polyethylene cap and
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in an NMR tube. Due to the high degree of conjugation, the sample fluoresces under
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Fully assembled 8 mm Shigemi tube, insert secured to outer tube with parafilm
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A J. Young NMR tube from above looking down the hole that leads to the T-bore.
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chromium left behind on the tubes causing interference with NMR experiments.
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has been added to these NMR tubes to remove all traces of organic material.
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and is forced to the base of the NMR tube and flushes the NMR tube out
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via the vacuum inlet). The NMR tube cap forms a vacuum seal. Solvent
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Close-up of the sample lying in between insert and "bottom length"
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Left to right: Flame, septum and polyethylene cap sealed NMR tubes
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may be wrapped around the cap to reduce solvent evaporation.
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Experimental organic chemistry: Principles and Practice
310:. The NMR cap rests on the outer tube of the apparatus 34:
is a thin glass walled tube used to contain samples in
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A vacuum is applied (usually via a 7: 601:Karsten Alstad Sørbye (2005-09-29). 322:is drawn from the solvent reservoir 211:Cleaning Tube fits within NMR tube, 98:layered on a cotton wool plug in a 1518:Scanning electron microscope (SEM) 472:"Shigemi NMR Microtube Assemblies" 109:' tap or even a very small rubber 14: 1563:Thermogravimetric analyzer (TGA) 1373:Nuclear magnetic resonance (NMR) 389: 377: 364: 344: 306:linked to the solvent reservoir 294:In this apparatus, the NMR tube 163: 151: 139: 46:NMR tubes are typically made of 83:is usually performed in a 90% H 102:, directly into the NMR tube. 1: 215:Solvent reservoir container, 195:NMR tube cleaning apparatus: 573:"NMR Tube Cleaner and Drier" 549:"Aldrich NMR Tube Cleaners" 1999: 1983:Nuclear magnetic resonance 1956: 1824: 1807: 1796: 1718:Time-domain reflectometer 1628: 1615: 1485:Liquid chromatograph (LC) 1448: 1435: 1108: 1095: 667: 656: 414:LLC, MESH Design Group. 1553:Melting-point apparatus 934:Cryogenic storage dewar 219:Solvent/solvent level, 1490:Mass spectrometer (MS) 1480:Gas chromatograph (GC) 228: 188: 72: 27: 1865:Acid-resistant gloves 1546:differential scanning 605:. spectroscopyNOW.com 194: 183: 70: 22: 1978:Laboratory glassware 1442:Analytical chemistry 944:Laminar flow cabinet 650:Laboratory equipment 16:Laboratory glassware 1814:Personal protective 723:Meker–Fisher burner 87:O (or buffer)/10% D 1657:Function generator 1640:Bench power supply 1579:Analytical balance 1340:Ostwald viscometer 1335:Graduated cylinder 1074:Inoculation needle 229: 203:Compound residue, 189: 73: 63:Sample preparation 48:borosilicate glass 28: 1965: 1964: 1952: 1951: 1948: 1947: 1925:Fire extinguisher 1915:Biosafety cabinet 1903: 1902: 1792: 1791: 1788: 1787: 1723:Transistor tester 1713:Spectrum analyzer 1611: 1610: 1607: 1606: 1431: 1430: 1427: 1426: 1303:Measuring devices 1125:Soxhlet extractor 1091: 1090: 1087: 1086: 1039:Spectrophotometer 1034:Pipeclay triangle 786:Mortar and pestle 603:"NMR Tube Washer" 357:ultraviolet light 1990: 1822: 1809: 1798: 1703:Network analyzer 1630: 1617: 1450: 1437: 1110: 1097: 1079:Inoculation loop 949:Microtiter plate 889:Test tube holder 781:Magnetic stirrer 669: 658: 643: 636: 629: 620: 614: 613: 611: 610: 598: 592: 591: 589: 588: 579:. 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Index


Parafilm
nuclear magnetic resonance spectroscopy
borosilicate glass
boron

Protein NMR
celite
Pasteur pipette
Schlenk
septum
Parafilm
protein NMR
Plunger/insert centre, left 8 mm "bottom length" outer tube suitable for Bruker and Varian NMR spectrometers, right 15 mm outer tube suitable for Varian only
Fully assembled 8 mm Shigemi tube, insert secured to outer tube with parafilm
Close-up of the sample lying in between insert and "bottom length"

Aqua regia

Dichloromethane
acetone
pipe cleaner
aqua regia
piranha solution
Chromic acid
paramagnetic
water aspirator
A sample of polythiophenes in an NMR tube. Due to the high degree of conjugation, the sample fluoresces under ultraviolet light.
polythiophenes
ultraviolet light

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