Complex Formation Products in the GeO2–Tartaric Acid–CuCl2–1,10-Phenanthroline System: Syntheses and Structures

Abstract

The cation-anionic coordination compounds based on the copper(II) complexes with Phen and tartratogermanate anions, [Cu(Phen)₃]₂[Ge₂(OH)(HTart)(µ-Tart)₂] · 11H₂O (I) and [CuCl(Phen)₂]₄[{Ge₂(OH)₂(µ-Tart)₂}Cl₂] · 4Н₂О (II), with different compositions and structures (CIF files CCDC nos. 1878102 (І) and 1878103 (ІІ)) are isolated for the first time from the GeO₂–tartaric acid (H₄Tart)–CuCl₂–1,10-phenanthroline (Phen) system. The structures of compounds I and II contain the same bridging tartrate anions. A specific feature of compound I is the additional HTart^3– anion, which does not perform the bridging function but is coordinated via the bis(chelate) mode, and the hydroxyl and carboxyl groups remain vacant. The dissociation of the carboxyl group results in the formation of the tartratogermanate anion with the charge –4.