Synthesis, structures and magnetic properties of copper(II) complexes with 1,2,3-triazole derivate as ligand: a single-crystal-to-single-crystal transformation from mononuclear to polymeric complex of copper(II)

• Published in: Transition metal chemistry (Weinheim) 2021-04, Vol.46 (4), p.315-322
• Main Authors: Ouyang, Fan, Jiang, Xiaofeng, Liu, Xianlong, Chen, Yunzhou, Chen, Yunfeng, Chen, Sihuai, Jia, Lihui
• Format: Article
• Language: English
• Subjects: Antiferromagnetism; Catalysis; Chemistry; Chemistry and Materials Science; Coordination compounds; Coordination polymers; Copper; Copper compounds; Couplings; Covalent bonds; Crystal lattices; Ferromagnetism; Inorganic Chemistry; Magnetic permeability; Magnetic properties; Organometallic Chemistry; Physical Chemistry; Single crystals; Triazoles
• ISSN: 0340-4285; 1572-901X
• DOI: 10.1007/s11243-021-00448-6

A new mononuclear complex Cu( tdp )Br 2 ·MeCN ( 1 , tdp  = 2,2′-(1H-1,2,3-triazole-1,4-diyl)dipyridine) has been synthesized, which can transform to a 1D coordination polymer [Cu( tdp )Br 2 ] n ( 2 ) under ambient conditions through an irreversible single-crystal-to-single-crystal transformation process. The loss of lattice MeCN molecules in 1 was accompanied by the generation of new covalent bonds and an increase in dimensionality from 0 to 1D, leading to a change in magnetic exchange couplings between the adjacent Cu(II) ions. Magnetic susceptibility measurements indicate that 1 exhibits ferromagnetic interactions between the adjacent Cu(II) centers, while the intrachain magnetic interactions between Cu(II) ions are antiferromagnetic within 2 .