Structural perception into the supramolecular self-assembly directed by C[sbnd]H•••π and π•••π interactions of 5,15-di(4′-carboxyphenyl)-10,20-di(pyrenyl) zinc porphyrin linker

Abstract

Solid state self-assembly of trans-A2B2 metalloporphyrin 5,15-Di(4′-carboxyphenyl)-10,20-Di(pyrenyl) zinc porphyrin linker Zn(H2O)-H2DcpDpyrP directed by CH•••π and π•••π interactions has been investigated. Crystallization of Zn-H2DcpDpyrP in solvent mixture (DMF and methanol) at high temperature followed by slow cooling resulted in the crystals of Zn(H2O)-H2DcpDpyrP (1). Scrutiny of the crystal structure reveals that porphyrin molecules are joined to form a one dimensional polymeric array through self-complimentary OH⋯O interactions between water molecules coordinated to the Zn(II) and 4-carboxyphenyl groups of adjacent molecules. Besides, C–H⋯π and π⋯π stacking interactions played a dominant role to generate extended two dimensional supramolecular sheets and provide stability to the structure. Hirshfeld surface analyses gave an insight into directional as well as strength of the intermolecular interactions. SEM data disclosed a plate shaped morphology which strongly supported the supramolecular self-assembly driven by OH⋯O, CH⋯π and π⋯π interactions.