pH-induced coordination assembly of mononuclear and dinuclear copper(II) complexes based on a 4,4′-bipyridinium analogue

Upon controlling coordination sites of a new bipyridinium analogue 4′-(N-carboxybenzyl-4-pyridinio)-2,2′:6′,2″-terpyridine chloride (HL·Cl) with different dosage of perchloric acid, two copper complexes with distinct bridging modes, {[Cu(L)Cl]·ClO4·3H2O}n (1) and [Cu2(HL)2Cl2]·4ClO4·H2O (2) have been obtained under hydrothermal condition. Complex 1 features a one-dimensional chain-like structure with mononuclear Cu(II) centers, while 2 is a dichloro-bridged dinuclear Cu(II) complex, which forms one-dimensional supramolecular chain via hydrogen bonding interactions between the carboxylic groups of HL ligands. The magnetic measurement reveals that an antiferromagnetic coupling interaction exists in complex 2.

Upon controlling coordination sites of a bipyridinium analogue with different dosage of acid, two Cu(II) complexes with different bridging modes were obtained. Complex 1 is a chain-like coordination polymer with mononuclear centers, while 2 is a dichloro-bridged dinuclear complex, which forms a one-dimensional supramolecular chain via hydrogen bonding. An antiferromagnetic coupling interaction exists in 2.Figure optionsDownload as PowerPoint slide