NaCu(2,4‐HPdc)(2,4‐Pdc)] Mixed Metal–Organic Framework as a Heterogeneous Catalyst

Abstract

AbstractThe synthesis of a new mixed metal–organic framework (M′MOF) has been accomplished by the metalloligand approach. [NaCu(2,4‐HPdc)(2,4‐Pdc)] (2,4‐H2Pdc = pyridine‐2,4‐dicarboxylic acid) has been obtained from the hydrothermal reaction of the metalloligand [Cu(2,4‐HPdc)2(H2O)2] NaOH, and a transition metal salt. [NaCu(2,4‐HPdc)(2,4‐Pdc)] is isostructural to [CuMn(2,4‐Pdc)2] and crystallizes in the triclinic space group P$\bar {1}$. The 3D structure is built up from [Cu(2,4‐HPdc)2(H2O)2] metalloligands and [NaO6] octahedra in a pcu α‐Po‐like uninodal six‐connected net. The compound is stable to 290 °C, and its crystal structure undergoes a 3 % volume expansion between room temperature and thermal decomposition. The unsaturated CuII centers at the surface act as a heterogeneous Lewis acid catalyst for the cyanosilylation of aldehydes and Knoevenagel C–C bond‐forming reactions. The catalytic activity has been compared with those of other copper(II) porous metal–organic frameworks such as HKUST‐1 and MOF‐74.