Non-monotonic lattice expansion in zeolitic imidazolate frameworks during heating

Abstract

The effect of substituting linkers with two additional methyl groups for conventional benzimidazolate on the thermal expansion behaviour of ZIF-62 was investigated by high-energy in situ X-ray diffraction. Increased structural integrity was observed with the addition of methyl groups, and variable anisotropic thermal expansion was discovered in ZIF-62 and its derivative.