Insight into the crystallization process: Relationships between crystal structures and properties of copper(ii) coordination polymers containing dimethylbis(4-pyridyl)silane

A systematic investigation into the favorable reaction conditions for construction of copper(ii) coordination polymers was carried out. Various reactions of copper(ii) bromide with dimethylbis(4-pyridyl)silane (L) produce two kinds of skeletal structures: the 1D loop-chain and the square-tubular helix. The fast-formation condition affords the 1D loop-chain, whereas the slow-formation condition yields the helical structure. The formation of significant condition-dependent structures can be partially attributed to the nature of the bromide anion and angle strain around the copper(ii) cation. The relationships between structures and physicochemical properties such as anion exchangeability, catalytic oxidation of 3,5-di-tert-butylcatechol, and thermal properties are discussed in these pages.