The synthesis, structure and third-order nonlinear optical effect of a new 2D cluster polymer based on a [WS4Cu4]2+ SBU and 1,2-di(pyridin-4-yl)ethane

Abstract

The self-assembly reaction of a multinodal preformed cluster with 1,2-di(pyridin-4-yl)ethane as the organic ligand afforded the 2D cluster polymer (1), {[(WS₄Cu₄)I₂(dpe)₂](DMF)₄}_n. There is a cavity between each two nearby dpe ligands in 1. The [WS₄Cu₄]²⁺ units are fixed by I⁻ ions, which is attributed to the multinodal feature of the W–S–Cu secondary building units, and therefore, the cavities in 1 are settled. The NLO properties show that 1 exhibits an optical self-focusing behavior and reverse saturable absorption effects. This work provides us with useful clues to further explore the 2D W–Cu–S-based cluster polymer with cavities.