Crystal structure of bis-[-di-aqua-bis-(phen-an-thro-line)cobalt(II)] bis-(citrato)germanate(IV) dinitrate.

The asymmetric unit of the title compound, [Co(CHN)(HO)][Ge(CHO)](NO), features two complex [(CHN)(HO)Co] cations, two NO anions as well as one centrosymmetric [(CHO)Ge] anion. Two HCit ligands (Cit = citrate, CHO) each coordinate three different oxygen atoms (hy-droxy-late, α-carboxyl-ate, β-carboxyl-ate) to the Ge atom, forming a slightly distorted octa-hedron. The coordination polyhedron of the Co atom is also octa-hedral, formed by coordination of four nitro-gen atoms from two phenanthroline mol-ecules and two water oxygen atoms.

[The influence of coordinational germanium compounds on the activity of glycosidases].

The ability of the synthesized compounds of germanium with bioligands to affect the biosynthesis and activity of alpha-amylase and alpha-L-rhamnosidase has been studied. It was established the most complexes tested induced biosyntheis of alpha-amylase of Bacillus subtilis 147 (119-252%) with the exception of Pam (Pyracetam) and II (Ge-nicotinic-citric acid). At the same time the biosynthesis of alpha-amylase of Bacillus licheniformis 234 and alpha-L-rhamnosidase of Penicillium commune was inhibited by a number of synthesized compounds.

The first observation of 4f-luminescence in new heteronuclear lanthanide-germanium complexes.

New lanthanide-germanium complexes with diethylenetriaminepentaacetic acid (DTPA) have been synthesized and were characterized by means of elemental analysis, IR-, UV-absorption and luminescent spectroscopy. The 4f-luminescence of heteronuclear Ln(Ge-DTPA)2 (Ln=Sm, Eu, Tb, Dy) complexes in aqueous solutions was investigated for the first time.

[Effect of coordinational germanium compounds on enzyme synthesis and activity].

Germanium complexes (IV) with succinic (H2Suc), oxyethyliminodiacetic (H2Oeida) and iminodisuccinic (H4Ids) acids as well as homo- and heteroligand germanium complexes (IV)--products of interaction of triammonium salt of oxyethylidendiphosphonic acid ((NH4)3HL) and oxyacids: tartaric (H4Tart), citric (H4Citr), trioxyglutaric (H4Toglut) acids have been synthesized. Composition of the obtained complexes: [Ge(OH)2(NaSuc)2].2H2O (I); [Ge(OH) (Oeida).