Guest driven structural transformation studies of a luminescent metal-organic framework

Abstract

A two-dimensional (2D) porous metal-organic framework (MOF) [{Zn2(L) 4(OTf) 4}.2(DCM).xG]n (1 ⊃ G) (OTf = trifluoro methane sulfonate, DCM = Dichloromethane, L (1, 4-bis (4-pyridyl)-2, 3-diaza-1, 3-butadiene) synthesized at room temperature. Free guests DCM were encapsulated in the pores of the MOF. On air drying the MOF loses free DCM molecules and changed its structure in a crystal to crystal manner to produce compound 1 [{Zn(L)2(OTf)2}.XG]n(1). This guest-induced breathing of the framework was also supported from PXRD patterns. Solid state photoluminescence properties of the dynamic MOF were studied at room temperature.