Reversible Transition between Discrete and 1D Infinite Architectures: A Temperature‐Responsive Cu(I) Complex with a Flexible Disilane‐Bridged Bis(pyridine) Ligand

Thermoresponsive molecular structure based on a disilane-bridged bis(pyridyl) ligand and CuI is reported. Single-crystal X-ray analysis revealed that there were two polymorphs in the Cu(I) complex: octanuclear copper(I) complex at 20 °C and 1D staircase copper(I) polymer complex at −173 °C. The formation of these polymorphs is due to the flexibility of the disilane-bridged ligand.

Abstract

A thermoresponsive structural change based on a disilane-bridged bis(pyridine) ligand and CuI is reported. Single-crystal X-ray analysis revealed that there are two polymorphs in the Cu(I) complex: octanuclear copper(I) complex at 20 °C and 1D staircase copper(I) polymer complex at −173 °C. The formation of these polymorphs is due to the flexibility of the ligand. Cu−I bond formation is observed upon cooling the sample from −10 °C to −170 °C. The temperature-induced phase transition progression was clarified by DSC, VT-PXRD, and VT-photoluminescence measurements and indicated a reversible temperature-controlled crystal-to-crystal phase transition. Observation on a VT-stage using a high-speed camera showed crystal cracking during single-crystal to single-crystal transitions between these polymorphic forms.

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