DIFFERENT-LIGAND COMPLEXES OF GERMANIUM(IV) WITH MANDELIC, GALLIC ACIDS AND HETEROCYCLIC AMINES
Journal Title: Вісник Одеського національного університету. Хімія - Year 2018, Vol 23, Issue 3
Abstract
Optimal synthesis methods of germanium(IV) coordination compounds with mandelic (Н2Mand), gallic (Н4Gal) acids and 1,10-phenantroline (phen), 2,2′-bipyridine (bipy) in water solution were developed. Their composition was established. Thermogravimetric analysis of coordination compounds with mandelic acid 1, 2 showed that complexes are crystallohydrates. Thermal destruction of both compounds is similar: the endothermic effect with the maximum at 100 °С and 90 °С is observed in the temperature range 70-230 °С (for 1) and 80-240 °С (for 2) respectively. This effect is followed by the weight loss about 3,3% for 1 and 6,1% for 2, which corresponds to one and two water molecules. The difference in thermal destruction of 3 and 4 (with gallic acid) is absence of low-temperature endo-thermic effects. Two consequent exothermic effects in the interval 260-520 °С are observed for 3 (for 4 - one exothermic effect at 340-520 °С), during which phen and bipy molecules ware eliminated. During the X-Ray analytics there was established that 3 (CCDC 1862035; e-mail: deposit@ccdc.cam.ac.uk) is different-ligand complex with distorted octahedral polyhedron, which is formed with four oxygen atoms of two molecules of gallic acid and two nitrogen atoms of 1,10-phenantroline. In the crystal 3 molecules are bonded between each other through hydrogen bonds and form three-dimensional net. In crystal c emptiness between molecules with the volume 1084.76 Å3 (which is 33% from the total unit cell volume) is formed along the crystallographic axis. In this article it is shown that mononuclear different-ligand complexes with octahedral coordination polyhedron of germanium [Ge(Mand)2(phen)]∙2H2O (1), [Ge(Mand)2(bipy)]∙H2O (2), [Ge(Н2Gal)2(phen)] (3), [Ge(Н2Gal)2(bipy)] (4) were formed. Their structures were suggested.
Authors and Affiliations
E. E. Martsinko, E. A. Chebanenko, I. I. Seifullina, V. V. Dyakonenko, S. V. Shishkina, J. R. Kim, M. I. Gromova
Keywords
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- EP ID EP494025
- DOI 10.18524/2304-0947.2018.3(67).140803
- Views 86
- Downloads 0
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