Siloxane-based linkers in the construction of hydrogen bonded assemblies and porous 3D MOFs

Abstract

A siloxane-based hexacarboxylic acid (L1-H₆) has been prepared and applied in MOF construction. L1-H₆ itself crystallizes as an unusual interpenetrated 3D hydrogen-bonded framework. Reaction of L1-H₆ with Zn(II) gave IMP-18 – a 3D MOF incorporating Si–O–Si functionality. Cleavage of L1-H₆ gives a silanol-based triacid which is shown to give a coordination polymer (IMP-19) with Zn(II).