Synthesis and characterization of binuclear molybdenum-polycarboxylate complexes with sulfur bridges.
A group of four binuclear sulfur-bridged molybdenum-polycarboxylato complexes with homocitrate, citrate, cysteine, ethylenediaminetetraacetate ligands, respectively, have been synthesized and characterized. These complexes were prepared in order to study the interaction of Mo and homocitrate in the FeMo-co of nitrogenases. In the structures of K4(NH4)2[Mo2O2S2(C6H4O7)2].10H2O (2), (NH4)2[Mo2O2S2(C3H5SNO2)2].5H2O (3) and (NH4)2[Mo2O2S2(C10H12N2O8)].3.5H2O (4), molybdenum (V) atom adopts a distorted octahedral arrangement through a terminal oxygen atom, two bridging sulfur atoms and three atoms from the ligand (hydroxyl, alpha-, beta-carboxylates, sulfide or amine). The coordination mode of homocitrate ligand in K5(NH4)[Mo2O2S2(C7H5O7)2].3H2O.CH3OH (1) has been proposed in a tridentate fashion via its hydroxyl and a pair of carboxylate groups (alpha-, beta-carboxylates). The electrochemical properties of these complexes have been discussed.
Li
Dong-Mei
DM
College of Chemistry and State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130023, PR China. liidm@yahoo.com
Xing
Yong-Heng
YH
Li
Zeng-Chun
ZC
Xu
Ji-Qing
JQ
Song
Wen-Bo
WB
Wang
Tie-Gang
TG
Yang
Guang-Di
GD
Hu
Ning-Hai
NH
Jia
Heng-Qing
HQ
Zhang
Hong-Min
HM