2-Chloro-3-fluoropyridine copper(II) complexes and the effect of structural changes on magnetic behavior

CuBr2 complexes with 3,5-disubstituted pyridine ligands

Reaction of copper(II) bromide with 3,5-di-chloro-pyridine (3,5-Cl2py) or 3,5-di-methyl-pyridine (3,5-Me2py) led to the isolation of the coordination polymers catena-poly[[bis-(3,5-di-chloro-pyridine)-copper(II)]-di-μ-bromido], [CuBr2(C5H3Cl2N)2] n or [CuBr2(3,5-Cl2py)2] n (1), and catena-poly[[bis-(3,5-di-methyl-pyridine)-copper(II)]-di-μ-bromido], [CuBr2(C7H9N)2] n or [CuBr2(3,5-Me2py)2] n (2), respectively. The structures are characterized by bibromide-bridged chains [d(av.)Cu⋯Cu = 3.93 (9) Å]. In 1, the chains are linked perpendicular to the a axis by non-classical hydrogen bonds and halogen bonds, while in 2, only non-classical hydrogen bonds are observed.

Halogen bond and polymorphism in trans-bis(2-iodo-5-halopyridine)dihalocopper(ii) complexes: crystallographic, theoretical and magnetic studies

As the halogen atom on position 5 of the 2I5YP ligand gets heavier the probability of crystallizing the syn-conformer increases; 2I5Cl-Cl crystallizes as the anti-conformer whereas 2I5Br-Cl crystallizes as syn- and anti-conformers.

Trinuclear copper(ii) bromide complex [C3H5N3Br]2n[Cu3Br8]n. Structure, magnetic properties and DFT calculations

Halidocuprates(ii) show unusual magnetic properties and a high degree of structural flexibility.