Supramolecular Salts of Germanium (IV) with Tartaric Acid, Zinc and 1,10-Phenanthroline/2,2'-Bipyridine: Synthesis, Structural Features and Selective Recognition

The study describes synthesis methods, structural features and thermal stability of the novel cation-anionic coordination compounds, crystallized in Sohnke chiral space group P2(1) [Zn(phen)(3)](2)[Ge-2(OH)(HTart)(mu-Tart)(2)] . 23H(2)O (1) and [Zn(bipy)(3)][Ge-2(OH)(2)(mu-Tart)(2)] . 5H(2)O (2). Dependently on the second heterocyclic ligand (1,10-phenanthroline - phen (1) or 2,2'-bipyridine -bipy (2)) complex zinc cations showed their ability to recognize selectively two different types of anions: dimeric [Ge-2(OH)(2)(mu-Tart)(2)](2-) (2) and more complex [Ge-2(OH)(HTart)(mu-Tart)(2)](4-) (1) with additional terminal tartaric acid ligand (HTart(3-)) and different coordination polyhedrons of Ge in its structure. Compounds 1 and 2 were characterized by X-Ray, IR, MS and thermogravimetric analyzes. Analysis of intermolecular interactions using Hirshfeld surface-based tools indicated the dominant role of various hydrogen intermolecular interactions such as H horizontal ellipsis H, H horizontal ellipsis O for both compounds, and C horizontal ellipsis C (pi...pi) for 1.

Automated summary

The study investigated the synthesis, structural features, and thermal stability of novel cation-anionic coordination compounds crystallized in a specific chiral space group. The complex zinc cations showed selective recognition abilities towards two different types of anions, depending on the second heterocyclic ligand used, and were characterized by various analytical methods. The analysis of intermolecular interactions highlighted the importance of hydrogen bonding and pi-pi interactions in the compounds.