Aromatic-like behavior of germanium nanocrystals

Optimized structures of (A) Ge18H12; (B) Ge19H12, peripheral germanium atoms (GeP), middle-layer germanium atoms (GeM) and the central germanium atom (GeC).

All-metallagermoxane with an adamantanoid cage structure: [(Cp*Ru(CO)2Ge)4(μ-O)6] (Cp* = η5-C5Me5)

The first tetrametallagermoxane [(Cp*Ru(CO)2Ge)4(μ-O)6], with an adamantanoid cage structure, has been synthesized and structurally characterized with an exo-{Cp*Ru(CO)2} fragment in each germanium atom.

New oligogermane with a five coordinate germanium atom: the preparation of 1-germylgermatrane

The first example of a hypercoordinate oligogermane was prepared and characterized.

A functionalized Ge3-compound with a dual character of the central germanium atom

A novel Ge3-compound with dual character of the central Ge atom has been synthesized via direct formation of a GeC bond by using a stable cyclic alkyl(amino) carbene.

Synthesis, characterization, antimicrobial, pesticidal and DNA cleavage activity of germanium(IV) derivatives of 3-(2-methyl-2,3-dihydro-benzthiazo-2-yl)-chromen-2-one and N′-[1-2-oxo-2H-chrome-3yl-ethylidene]-hydrazinecarbodithionic acid benzyl ester ligands

The new ligands 3-(2-methyl-2,3-dihydro-benzthiazo-2-yl)-chromen-2one (AcBzH) and N′-[1-2-oxo-2H-chrome-3yl-ethylidene]-hydrazinecarbodithionic acid benzyl ester (AcBDTZH) were prepared by the reaction of 3-acetyl-2H-chromen-2-one with 2-aminothiophenol and S-benzyl dithiocarbazate, respectively. The germanium(IV) complexes have been prepared by reacting Ph3GeCl and Me3GeCl in 1:1 molar ratio with these monofunctional bidentate AcBzH and AcBDTZH ligands by using microwave as well as conventional heating methods for comparison purposes. All the synthesized compounds were characterized by elemental analyses, melting point, IR, 1H-NMR 13C-NMR, mass and X-ray powder diffraction techniques. These studies showed that the ligands coordinated to the germanium atom in a monobasic bidentate manner and trigonal bipyramidal environment around the germanium atom have been established for the complexes. To evaluate the effect of metal ion upon chelation, both ligands and their complexes have been screened for their antimicrobial activity against the various pathogenic bacterial and fungal strains. The metal complexes have shown antimicrobial activity as compared to the free ligands. The pesticidal activity and DNA cleavage activity of both ligands and their metal complexes have been tested and discussed.