草酸根配合物

草酸根配合物是含有草酸根（C₂O₄²⁻）配體的配合物。草酸根是一种双齿配体。^[1]作为一种小的对称双阴离子，草酸根通常会形成MO₂C₂五元环。草酸根配合物中也可以有其它配体，例如 [Co(C₂O₄)(NH₃)₄]^κ+。^[2]

草酸根配合物中很多都只含草酸根，它们的通式为 [M(κ²-C₂O₄)₃]^n-，其中M = V(III)、Mn(III)、^[3]Cr(III)、Tc(IV)、Fe(III)、Ru(III)、Co(III)、Rh(III)和Ir(III)。这些阴离子有手性（D₃对称性），有些对映异构体可以分离。^[4]一些金属也可以形成有四个草酸根的配合物 [M(κ²-C₂O₄)₄]^n-，其中 M = Nb(V)、^[5]Zr(IV)、^[6]Hf(IV)^[7]和Ta(V)。^[8]

草酸根也可以作为一种桥接配体，形成含有 (κ²,κ'²-C₂O₄)M₂核心的双核或多核配合物。双核草酸根配合物的通式为 [M₂(C₂O₄)₅]^n-，其中 M = Fe(II)^[9]和Cr(III)^[10]。

• 二草酸根合镍(II)酸盐

1. ^ Krishnamurty, Kotra V.; Harris, Gordon M. The Chemistry of the Metal Oxalato Complexes. Chemical Reviews. 1961, 61 (3): 213–246. doi:10.1021/cr60211a001. 
2. ^ Bernal, Ivan; Cetrullo, James. The phenomenon of conglomerate crystallization. XIX. Clavic dissymmetry in coordination compounds. XVII. Structural Chemistry. 1990, 1 (2–3): 235–243. S2CID 96021604. doi:10.1007/BF00674267. 
3. ^ Lis, T.; Matuszewski, J. Structure of potassium tris(oxalato)manganate(III) trihydrate. Acta Crystallographica Section B. 1980, 36 (8): 1938–1940. doi:10.1107/S0567740880007558. 
4. ^ Kauffman, George B.; Takahashi, Lloyd T.; Sugisaka, Nobuyuki. Resolution of the Trioxalatocobaltate(III) Ion. Inorganic Syntheses 8. 1966: 207–211. ISBN 9780470132395. doi:10.1002/9780470132395.ch55. 
5. ^ Cotton, F. A.; Diebold, Michael P.; Roth, W. J. Variable Stereochemistry of the Eight-Coordinate Tetrakis(oxalato)niobate(IV), Nb(C₂O₄)₄^4-. Inorganic Chemistry. 1987, 26 (17): 2889–2893. doi:10.1021/ic00264a035. 
6. ^ Fu, Yun-Long; Ren, Jia-Lin; Xu, Zhi-Wei; Ng, Seik Weng. Bis(4,4′-bipyridinium) Tetrakis(oxalato-κ2O,O′)zirconate(IV). Acta Crystallographica Section E. 2005, 61 (11): m2397–m2399. doi:10.1107/S1600536805033829. 
7. ^ Tranqui, D.; Boyer, P.; Laugier, J.; Vulliet, P. Structure cristalline du tétrakisoxalatohafniate de Potassium Pentahydraté [K4Hf(C2O4)4.5H2O]. Acta Crystallographica Section B. 1977, 33 (10): 3126–3133. doi:10.1107/S0567740877010395. 
8. ^ Perić, Berislav; Brničević, Nevenka; Jurić, Marijana; Planinić, Pavica; Matković-Čalogović, Dubravka. [NH₄][(CH₃)₂NH₂]2[Ta(C₂O₄)₄]·2H₂O: The First (Oxalato)tantalate(V) Complex Structurally Characterized. Structural Chemistry. 2009, 20 (5): 933–941. S2CID 96838371. doi:10.1007/s11224-009-9494-0. 
9. ^ Armentano, Donatella; De Munno, Giovanni; Lloret, Francesc; Julve, Miguel. Bis and Tris(oxalato)ferrate(III) Complexes as Precursors of polynuclear compounds. CrystEngComm. 2005, 7 (7): 57. doi:10.1039/b417251e. 
10. ^ Masters, Vanessa M.; Sharrad, Clint A.; Bernhardt, Paul V.; Gahan, Lawrence R.; Moubaraki, Boujemaa; Murray, Keith S. Synthesis, Structure and Magnetism of the Oxalato-Bridged Chromium(III) Complex [NBuⁿ₄]₄[Cr₂(ox)₅]·2CHCl₃. Journal of the Chemical Society, Dalton Transactions. 1998, (3): 413–416. doi:10.1039/a705265k.