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The x-ray diffraction studies of ternary and quaternary molybdenum cluster chalcohalides show that these are positively charged zigzag chains containing Te-halide ions.

Single crystals of Ta4S9Br8 are obtained by heating Ta, S, and Br2 and the structure is determined by X-ray analysis consisting of molecular clusters [Ta4(mu4-S)(mu-S2)4Br8]. The compound is soluble in CH3CN, giving a dark-red solution with a characteristic electronic spectrum, which is assigned on the basis of DFT calculations.

The importance of specific interactions between heavier nonmetals is increasingly recognized. In addition to halogen-halogen, chalcogen-chalcogen, and pnictogen-pnictogen interactions, the chalcogen-halogen contacts to be added to the list of noncovalent interactions essential for specific packing and supramolecular aggregation.

Research has been conducted on the aqua ions. The preparation of these ions has been carried out and their X-ray crystal structure has been determined and is described.

Research has been conducted on the mercury-containing purple corner-shared [Mo (sub)6 HgS (sub)8 (H (sub)2 O) (sub)18] (super)8+ double cube derivative of green [Mo (sub)3 S (sub)4 (H (sub)2 O) (sub)9] (super)4+. The preparation of this derivative under the air-free conditions via the reaction with Hg (super)0 and with Hg (super)I (sub)2 is described.

Incomplete cuboidal clusters when reacted with group 14 and 15 metal complexes with [s.sup.2][p.sup.0] electronic configuration resulted in the formation of heterometal incorporated cuboidal clusters. X-ray diffraction studies showed the cuboidal clusters as weak complexes of the cluster tridentate ligand with [EX.sub.3].

The synthesis of oxalate-bridged heteropolynuclear molecular complexes and coordination polymers by reacting aqueous [[[W.sub.3][S.sub.7][([C.sub.2][O.sub.4]).sub.3].sup.2-] with [Ln.sup.3+] and [Th.sup.4+] in a 1:1 molar ratio is described and are further characterized by X-ray structure analysis and IR spectroscopy. It is inferred that oxalate cluster complex can work as building block for the polymeric model in two ways, by direct coordination of a heterometal through oxalate oxygens and by axial contacts, which, in turn, connects together the cluster fragments.

In high yield black single crystals of Ta4Se9I8 are obtained by heating Ta, Se, and I2 at 300 degree Celsius in 1:2.2L1.0 molar ratio. The titanium atoms form a square in the structure with four Se2 ligands bridging the Ta-Ta edges and one capping the square.

Two examples of a new family of supramolecular assemblies based on cucurbituril adduct of hydrogen-bonded molybdenum and tungsten incomplete cuboidal aqua complexes are presented. The novel molecular container assemblies are capable of encapsulation of guest molecules in solution.

Research has been conducted on the phosphorous and arsenious acids. The isolation and X-ray crystal structures of the P(OH) (sub)3 and As(OH) (sub)3 complexes have been investigated and the results are reported.

Reaction of [(C6H6)RuCl2]2 and Na8[Ta6O19] gives two new hybrid organometallic POM complexes, Na10[{(C6H6)RuTa6O18}2(µ-O)]·39.4H2O (Na10-1) and Na4(trans-[{(C6H6)Ru}2Ta6O19]·20H2O (Na4-2). In both cases the half-sandwich fragments {(C6H6)Ru}2+ are coordinated as additional vertices to the {Ta3(µ2-O)3} triangles of the hexatantalate. According to NMR and ESI-MS data, the dimeric complex [{(C6H6)RuTa6O18}2(µ-O)]10- dissociates in water with the formation of monomeric [(C6H6)RuTa6O19]6- species (1a). X-ray structural characterization and aqueous speciation of the complexes by 13C, ¹H, and DOSY NMR; ESI-MS; and capillary electrophoresis (CE) have been carried out. [ABSTRACT FROM AUTHOR]

The reaction of [Mo6I14]2- with methyl propiolate HC=CC(O)OMe in the presence of Ag+ and Et3N yielded the new luminescent complex [Mo6I8(C=CC(O)OMe)6]2-, the first fully organometallic complex in the family of octahedral {M6X8} clusters. The cluster was crystallized as tetraphenylphosphonium salt and characterized by X-ray single-crystal diffraction and elemental analyses, mass spectrometry, 13C NMR, UV-vis, and luminescence spectroscopies. [ABSTRACT FROM AUTHOR]