Incomplete Cubane-Type Sulfur-Capped Aqua Ion, W3O2S24+ and X-Ray Structure of Ba[W3O2S2(N(CH2CO2)2(CH2CO2H))3]·9H2O

Abstract

A triangular tungsten(IV) aqua ion with sulfur bridges, W3O2S24+ has been prepared and characterized. X-ray structure analysis of a derivative complex, [W3O2S2(Hnta)3]2−(H3nta = nitrilotriacetic acid) has revealed that its core is of structure of W3(μ2-O)2(μ2-S)(μ3-S). The electronic spectrum of the aqua ion has an absorption peak at 506 nm (ε = 381 M−1 cm−1 per trimer; 1 M = 1 mol dm−3).

Cuboidal W3S4 Cluster Complexes as New Generation X-ray Contrast Agents

“…We have been exploring for some time the use of heavy metal ( Z > 53) cluster complexes to provide a new generation of X-ray contrast agents, based on their superior X-ray attenuation characteristics when compared to iodine-based agents . The cuboidal, trinuclear tungsten cluster [W 3 Q 4 ] 4+ (Q = O, S) has been explored as an entry point to a new generation of X-ray contrast agents based on its synthetic accessibility, stability, and presumed ability to strongly bind polyaminopolycarboxylate ligand systems. − …”

Dimeric W3SO3 Cluster Complexes: Synthesis, Characterization, and Potential Applications as X-ray Contrast Agents

“…Recently, our research effort in this area was extended to another symmetric aqua ion, [W IV 3 SO 3 (H 2 O) 9 ] 4+ , in the [W IV 3 S x O 4 - x ] 4+ ( x = 0−4) series. − In this report, we describe an improved, large-scale synthesis of its chloride salt, [W IV 3 SO 3 (H 2 O) 9 ]Cl 4 ( 4 ), the synthesis of some uncommon linear polyaminopolycarboxylate ligands with two terminal iminodiacetate groups (bis-IDA), and the preparation of a series of 2:3 cluster−ligand complexes with the W IV 3 SO 3 core. These dimeric trinuclear tungsten cluster complexes were fully characterized using routine analytical techniques and the solid state structures of two representatives were determined by X-ray crystallography.…”