358:
440:
27:
386:, due to the oxygen atoms in the oxalate anions (the "ligands") donating a lone pair to the p and d orbitals of the iron atom (the "center" of the complex). The center has three electrons in its d orbitals, leaving 13 empty places in the remaining d and p orbitals. Twelve of these are filled by electrons from the ligands.
74:
373:
In the absence of light or other radiation, the ferrioxalate complex is quite stable. The potassium and sodium salts and their solutions can be heated to near 100 °C for hours without significant decomposition.
782:
Junko Akashi, Yoshio Uchida, Tomoko Kojima, Motomi Katada, and
Hirotoshi Sano (1984): "Mössbauer Spectroscopic Studies of the Effects of the 6Li(n, α)T Reaction in Lithium Tris(oxalato)ferrate(III)".
428:
as it can form two non-superimposable geometries. In accordance with the IUPAC convention, the isomer with the left-handed screw axis is assigned the Greek symbol
740:
Pozdnyakov, Ivan P.; Kel, Oksana V.; Plyusnin, Victor F.; Grivin, Vyacheslav P.; Bazhin, Nikolai M. (2008). "New
Insight into Photochemistry of Ferrioxalate".
158:
697:
Hatchard, C. G.; Parker, C. A. (1956). "A new sensitive chemical actinometer. II. Potassium ferrioxalate as a standard chemical actinometer".
681:
630:
Junk, Peter C. (2005). "Supramolecular interactions in the X-ray crystal structure of potassium tris(oxalato)ferrate(III) trihydrate".
570:, the measurement of light and higher-energy electromagnetic radiation. Potassium ferrioxalate is over 1000 times more sensitive than
824:
133:
390:
227:
357:
409:
819:
312:
270:
814:
342:
361:
346:
334:
673:
749:
706:
383:
605:
563:
338:
247:
40:
722:
647:
397:
765:
677:
610:
574:, the compound previously used for these purposes. While the complex itself is insensitive to
425:
787:
757:
714:
665:
639:
590:
181:
94:
439:
50:
809:
511:
753:
710:
583:
571:
515:
457:
316:
221:
432:(lambda). Its mirror image with the right-handed screw axis is given the Greek symbol
803:
651:
582:
salt can be used to measure them. A lithium-6 nucleus can absorb a neutron and emit
726:
326:) and reduction of the iron(III) atom to iron(II). This property is exploited for
308:
119:
643:
567:
413:
327:
307:
The ferrioxalate anion gives a lime green color to salts, and in solution it is
206:
85:
405:
278:
769:
718:
26:
791:
596:
with high energies, which presumably decompose the nearby ferrioxalate.
401:
579:
575:
301:
281:
106:
761:
438:
461:
220:
Except where otherwise noted, data are given for materials in their
507:
356:
250:
73:
63:
142:
InChI=1S/3C2H2O4.Fe/c3*3-1(4)2(5)6;/h3*(H,3,4)(H,5,6);/q;;;+3/p-6
274:
400:, within which the six Fe–O bond distances all close to 2.0
389:
The iron center in the ferrioxalate anion has a distorted
562:
This reaction provides an efficient chemical method for
311:. The anion is sensitive to light and higher-energy
412:. The ammonium and mixed sodium-potassium salts are
315:, which causes the decomposition of one oxalate to
456:In solution, the ferrioxalate complex undergoes
118:
416:, as are related complexes with Al, Cr, and V.
49:
464:of light and subsequently decomposes to form
8:
699:Proceedings of the Royal Society of London
510:(gains an electron) from the +3 to the +2
460:. In this process, the complex absorbs a
93:
18:
784:Bulletin of the Chemical Society of Japan
349:salts have also received some attention.
333:The most common and most-studied salt is
277:atom in the +3 oxidation state and three
408:; as the low spin complex would display
322:
287:
264:
260:
256:
786:, volume 57, issue 4, pages 1076-1078.
622:
166:C(=O)(C(=O)).C(=O)(C(=O)).C(=O)(C(=O)).
163:
138:
514:, while an oxalate ion is oxidised to
145:Key: FYJLUEWYCIBBGT-UHFFFAOYSA-H
7:
404:which indicates that the Fe(III) is
109:
424:The ferrioxalate complex displays
14:
393:. The ferrioxalate complex has D
382:The complex is held together by
25:
224:(at 25 °C , 100 kPa).
196:
187:
1:
644:10.1080/00958970512331334250
193:
841:
825:Light-sensitive chemicals
670:Chemistry of the Elements
668:; Earnshaw, Alan (1997).
313:electromagnetic radiation
218:
174:
154:
129:
33:
24:
271:transition metal complex
410:Jahn–Teller distortions
244:trisoxalatoferrate(III)
719:10.1098/rspa.1956.0102
506:. The iron centre is
443:
365:
362:Potassium ferrioxalate
335:potassium ferrioxalate
674:Butterworth-Heinemann
666:Greenwood, Norman N.
442:
384:dative covalent bonds
360:
792:10.1246/bcsj.57.1076
754:2008JPCA..112.8316P
711:1956RSPSA.235..518H
606:Sodium ferrioxalate
391:octahedral geometry
378:Molecular structure
214: g·mol
21:
444:
398:molecular symmetry
366:
228:Infobox references
19:
820:Oxalato complexes
762:10.1021/jp8040583
748:(36): 8316–8322.
683:978-0-08-037941-8
611:Iron(III) oxalate
426:helical chirality
300:anions acting as
273:consisting of an
236:Chemical compound
234:
233:
75:Interactive image
832:
794:
780:
774:
773:
742:J. Phys. Chem. A
737:
731:
730:
705:(1203): 518–36.
694:
688:
687:
672:(2nd ed.).
662:
656:
655:
627:
595:
588:
558:
557:
556:
548:
547:
537:
536:
535:
505:
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503:
493:
492:
491:
483:
482:
474:
473:
325:
299:
298:
297:
294:
268:
213:
198:
195:
189:
182:Chemical formula
122:
111:
97:
77:
53:
29:
22:
840:
839:
835:
834:
833:
831:
830:
829:
800:
799:
798:
797:
781:
777:
739:
738:
734:
696:
695:
691:
684:
664:
663:
659:
629:
628:
624:
619:
602:
593:
586:
555:
552:
551:
550:
546:
543:
542:
541:
539:
534:
531:
530:
529:
527:
512:oxidation state
502:
499:
498:
497:
495:
490:
487:
486:
485:
481:
478:
477:
476:
472:
469:
468:
467:
465:
454:
449:
422:
396:
380:
371:
355:
324:
320:
295:
292:
291:
289:
285:
266:
262:
258:
254:
237:
230:
225:
211:
201:
192:
184:
170:
167:
162:
161:
150:
147:
146:
143:
137:
136:
125:
112:
100:
80:
67:
56:
43:
17:
12:
11:
5:
838:
836:
828:
827:
822:
817:
815:Iron complexes
812:
802:
801:
796:
795:
775:
732:
689:
682:
657:
638:(4): 355–361.
632:J. Coord. Chem
621:
620:
618:
615:
614:
613:
608:
601:
598:
584:alpha particle
572:uranyl oxalate
560:
559:
553:
544:
532:
516:carbon dioxide
500:
488:
479:
470:
458:photoreduction
453:
452:Photoreduction
450:
448:
445:
421:
418:
394:
379:
376:
370:
367:
354:
351:
317:carbon dioxide
235:
232:
231:
226:
222:standard state
219:
216:
215:
209:
203:
202:
199:
190:
185:
180:
177:
176:
172:
171:
169:
168:
165:
157:
156:
155:
152:
151:
149:
148:
144:
141:
140:
132:
131:
130:
127:
126:
124:
123:
115:
113:
105:
102:
101:
99:
98:
90:
88:
82:
81:
79:
78:
70:
68:
61:
58:
57:
55:
54:
46:
44:
39:
36:
35:
31:
30:
15:
13:
10:
9:
6:
4:
3:
2:
837:
826:
823:
821:
818:
816:
813:
811:
808:
807:
805:
793:
789:
785:
779:
776:
771:
767:
763:
759:
755:
751:
747:
743:
736:
733:
728:
724:
720:
716:
712:
708:
704:
700:
693:
690:
685:
679:
675:
671:
667:
661:
658:
653:
649:
645:
641:
637:
633:
626:
623:
616:
612:
609:
607:
604:
603:
599:
597:
592:
585:
581:
577:
573:
569:
565:
525:
521:
520:
519:
517:
513:
509:
463:
459:
451:
446:
441:
437:
435:
431:
427:
419:
417:
415:
411:
407:
403:
399:
392:
387:
385:
377:
375:
368:
363:
359:
352:
350:
348:
344:
340:
336:
331:
329:
318:
314:
310:
305:
303:
283:
280:
276:
272:
253:with formula
252:
249:
245:
241:
229:
223:
217:
210:
208:
205:
204:
186:
183:
179:
178:
173:
164:
160:
153:
139:
135:
128:
121:
117:
116:
114:
108:
104:
103:
96:
92:
91:
89:
87:
84:
83:
76:
72:
71:
69:
65:
60:
59:
52:
48:
47:
45:
42:
38:
37:
32:
28:
23:
20:Ferrioxalate
783:
778:
745:
741:
735:
702:
698:
692:
669:
660:
635:
631:
625:
561:
523:
455:
433:
429:
423:
388:
381:
372:
332:
306:
243:
240:Ferrioxalate
239:
238:
34:Identifiers
568:actinometry
414:isomorphous
328:actinometry
309:fluorescent
269:. It is a
175:Properties
804:Categories
617:References
564:photometry
353:Properties
337:, but the
207:Molar mass
86:ChemSpider
62:3D model (
51:15321-61-6
41:CAS Number
652:216142329
526:→ 2 + 2
447:Reactions
436:(delta).
420:Chirality
406:high spin
369:Stability
364:crystals.
279:bidentate
255:[Fe(C
248:trivalent
770:18707071
727:98652159
600:See also
576:neutrons
343:ammonium
750:Bibcode
707:Bibcode
580:lithium
508:reduced
347:lithium
302:ligands
282:oxalate
212:319.901
107:PubChem
810:Anions
768:
725:
680:
650:
591:triton
589:and a
578:, the
462:photon
345:, and
339:sodium
159:SMILES
120:167279
95:146351
723:S2CID
648:S2CID
522:2 +
284:ions
251:anion
246:is a
134:InChI
64:JSmol
766:PMID
678:ISBN
566:and
494:and
466:Fe(C
275:iron
788:doi
758:doi
746:112
715:doi
703:235
640:doi
242:or
110:CID
16:Ion
806::
764:.
756:.
744:.
721:.
713:.
701:.
676:.
646:.
636:58
634:.
587:He
538:+
528:CO
524:hν
518::
496:CO
341:,
330:.
321:CO
304:.
293:2−
200:12
194:Fe
790::
772:.
760::
752::
729:.
717::
709::
686:.
654:.
642::
594:H
554:4
549:O
545:2
540:C
533:2
501:2
489:2
484:)
480:4
475:O
471:2
434:Δ
430:Λ
402:Å
395:3
323:2
319:(
296:4
290:O
288:2
286:C
267:]
265:3
263:)
261:4
259:O
257:2
197:O
191:6
188:C
66:)
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