Reversible crystal deformation of a single-crystal host of copper(II) 1-naphthoate-pyrazine through crystal phase transition induced by methanol vapor sorption.

A novel microporous single crystal of [Cu(II)2(1-NA)4(pyz)]n (1-NA: 1-naphthoate, pyz: pyrazine) exhibited bending and straightening action on a macroscopic scale during the first-order crystal phase transition induced by methanol vapor sorption.