Structural chemistry of Cu(I) π-coordination compounds with allyl derivatives of heterocycles

Abstract

Copper(I) π-coordination compounds are quite appealing objects for interdisciplinary research in view of their catalytic, photoluminescent, ferroelectric, and nonlinear optical properties [1]. Cu(I)-olefin complexes based on allyl derivatives of organic heterocycles (ADH) dominateу the crystal engineering of mentioned coordination compounds. That is defined by a specific concurrent coordination of heterocyclic donor atoms and “soft base” – allylic C=C bond to the central “soft acid” Cu+ ion. Crystalline compounds, self-assembled from the above organic ligands under the differently modified conditions of the alternating-current electrochemical technique, attract attention due to the presence of various Cu(I) salts (which are unstable or unknown in a free state): CuNO3, CuHSO4, Cu2SO4, Cu2SiF6, Cu(NH2SO3), etc. Usually, ADH in the structures of the obtained complexes performs a π,σ-bridging or π,σ-chelate-bridging function, linking the Cu(І) ions into island fragments or coordination polymers of different dimensions.