A Ladder‐like One‐dimensional Chain Based on a New Biradical and Cu^II: Crystal Structure and Magnetic Properties

Abstract

A new biradical di(4-(1'-oxyl-3'-oxido-4',4',5',5'-tetramethyl-4',5'-dihydro-1'H-imidazol-2'-yl)phenyl) ether (1) and its copper complex 2 were synthesized and characterized structurally. The X-ray structure determination revealed that, the complex is in the triclinic P-1 space group and displays a ladder-like structure. Each copper atom is surrounded by four oxygen atoms from hexafluoroacetylacetone and two oxygen atoms from biradical. The magnetic measurements show that biradical 1 exhibits a weak intramolecular nitroxide-nitroxide antiferromagnetic coupling and copper complex 2 possesses weak ferromagnetic coupling (J＝5.09 cm -1 ) between Cu II and radical, which attributed to interaction between copper spin and the axially coordinated nitronyl nitroxide spin.