On the preparation of binuclear S, S bridged molybdenum(V) complexes crystal and molecular structure of [Mo₂S₄(Et₂dtc)₂]

Abstract

MoO42− is reduced by diethyldithiocarbamate (Et2dtc−) on prolonged digestion in aqueous medium whereby the complex [Mo2VO2S2(Et2dtc)2] is formed. The central moiety Mo2O2S22+ has a high formation tendency. When [Mo2V(S2)6]2− is refluxed with Et2dtc− in ethanol, [Mo2VS (Et2dtc)2] is formed, the X‐ray crystal structure of which has been determined (space group P212121, a = 10.550(2) Å, b = 13.820(5) Å, c = 14.723(12) Å, dc = 1.90 g · cm3−, Z = 4). The MoMo distance of the diamagnetic compound is 2.817(2) Å and the average Mo=St distance 2.099(4) Å.

Preparation and electrochemical investigation of monomeric complexes of molybdenum(0-VI) with the ligand 1,4,7-trimethyl-1,4,7-triazacyclononane (L). Crystal structure of [MoIVLBr3](PF6)

“…[LMoiv(NCS)3]+ 3=£ [LMom(NCS)3]°[ LMon(NCS)3]" (4) Thus all Mo(III) complexes of the type [MoLX3] (X = Cl, Br, I, SCN) are reversibly oxidized electrochemically to the corresponding Mo(IV) species, [MoLX3]+. The redox potentials for these Mo(IV)/Mo(III) couples are quite positive and span the relatively small range from +0.395 V (X = Cl-) to +0.53 V (X = SCN-) vs. the Fc+/Fc couple.…”

“…The ligand 1,4,7'-trimethyl-1,4,7-triazacyclononane has been prepared as described previously. 4 The perchlorate salts are potentially hazardous; they may explode upon heating. Only small quantities were prepared.…”

The role of surface roughness and slide-roll ratio on the decomposition of MoDTC in tribological contacts

“…The peaks observed at 510 cm -1 and 556 cm -1 were attributed to v(S-S) vibrations of bridging and terminal sulphur atoms [12] while the peak at 750 cm -1 was attributed to bridging oxygen atoms [13,14]. The peak at 960 cm -1 is due to vibration of terminal oxygen atoms v(Mo=O) most probably from unreacted MoDTC that is trapped between asperities on the rough surface [15]. The broad peaks at 1370 cm -1 and 1580 cm -1 are due to formation of amorphous carbon [16].…”

Crystal and molecular structure of [N(CH3)4]2[Mo2O2S2(S2)2]: a compound with two S22- ligands

“…-4( 2) 5 (2) 8( 2) S( 6) 1125 ( 2) 2078 ( 7) 4327 ( 4) 70 (3) 54 (3) 39 ( 2) 9( 2) 15 (2) 5 (3) 1129 ( 2) 2063 ( 7) 4312 ( 4) 69( 3) 44( 2) 31 (2) 8( 2) 16 (2) 1 ( 2) 0( 1)…”