Structural Diversity of Heteroleptic Cobalt(II) Dicyanamide Coordination Polymers with Substituted Pyrazines and Pyrimidines as Auxiliary Ligands

TL;DR

This paper explores how different ligands affect the structure of cobalt(II) dicyanamide coordination polymers, revealing new chain and 3D architectures.

Contribution

The study reports the synthesis and structural characterization of 13 new cobalt(II) dicyanamide coordination polymers with substituted pyrazines and pyrimidines.

Findings

Eight compounds formed single-chain structures with [Co(Lpyz/pym)2]2+ units bridged by dca ligands.

Two complexes exhibited neutral triple-chain topologies with unique bridging patterns.

2D and 3D architectures were observed only in specific ligand combinations like 2,6–Me2pyz and 4-NH2-pym.

Abstract

A series of cobalt(II) dicyanamide (dca−) coordination polymers with substituted pyrazines (pyz) and pyrimidines (pym) as auxiliary ligands have been synthesized and structurally characterized to investigate the influence of the type and substitution pattern of the auxiliary ligand on the dimensionality and topology of the resulting frameworks. As a result of our studies, 13 novel heteroleptic cobalt(II) dicyanamide coordination polymers were obtained, and their crystal structures were determined by single-crystal X-ray diffraction. Eight of the investigated compounds exhibit a single-chain structure composed of [Co(Lpyz/pym)2]2+ units bridged via double μ1,5–dca ligands. In two complexes, neutral triple-chain topologies were observed, in which double μ1,5– and single μ1,3,5–dca bridges connect two crystallographically independent cobalt(II) ions, both being six-coordinate in tetragonally elongated octahedral environments. Two- and three-dimensional architectures were confirmed only in the case of Co(II) compounds with 2,6–Me2pyz and 4-NH2-pym co-ligand, respectively The cobalt(II) complexes described herein have also been compared with dicyanamide-based cobalt(II) systems incorporating pyrazine- and pyrimidine-like ligands. These structural relationships are of high significance for the rational design and synthesis of heteroleptic cobalt(II) dicyanamide systems.

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