Trinuclear copper(II) complexes with bridging (N–N) diazine ligands: structural and magnetic studies

Heptacopper(II) and dicopper(II)-adenine complexes: synthesis, structural characterization, and magnetic properties

“…These "weak" interactions are due to the large distances between the dimers in the chain. In addition, the magnitude of magnetic exchange interaction J 1 is comparable to that reported in the literature for other copper complexes [62,63]. Indeed, as expected from the p eff , the Landé factor has an almost pure spin contribution, indicating an almost ideal quenching of the orbital contribution to the total angular moment.…”

Self-assembled polynuclear clusters derived from some flexible polydentate dihydrazide ligands

“…2poap, show considerable versatility in their coordination modes, forming trinuclear, 36 Pttp has the potential to bind metals in a variety of different ways, with involvement of the ligand ends, and the oxalic hydrazone fragments, and the possibility of simultaneous coordination of the terminal pyridine fragments to two metals, and the hydrazone fragment to a third. With metal perchlorates, tetrafluoroborates and in the case of cobalt bromide, the only coordination mode observed so far involves the self assembly of metals and ligands into tetranuclear clusters.…”

A 1D zinc(II) polymer with W-like pentanuclear secondary building blocks constructed by 2,6-pyridine-diacylhydrazone ligand

“…Indeed, many polynuclear complexes of 2,6-pyridinediacylhydrazone have been reported [21][22][23][24][25][26][27][28][29]. It is interest to see that most of which are trinuclear complexes [2,30,31] and nonanuclear clusters with [3 9 3] grid-type architectures [23,[32][33][34][35][36][37][38][39][40]. Taking the ligands derived from the condensation of 2,6-pyridinedihydrazide with aldehyde as examples, it was reported that a trinuclear copper (II) complex was obtained with 2,6-bis[(salicylidene)hydrazinocarbonyl]pyridine as ligand, in which the ligand coordinates to copper(II) ions in tridentate modes in two terminal compartments defined by the hydrazonic nitrogen, acyl oxygen, and phenolic oxygen, and in the central chamber defined by the pyridyl nitrogen and two hydrazonic nitrogens [30].…”

“…Pyridine-acylhydrazone ligands with Py-CO-NH-N=CH-fragment have been extensively applied for the preparation of metal complexes in coordination chemistry due to their various coordination modes which depend strongly on the conformational flexibility of the end groups around the N-N single bonds [1][2][3][4]. As reported, the synergistic effect of pyridine and acylhydrazone groups in a pyridineacylhydrazone ligand can normally lead to the formation of polynuclear complexes which exhibit unusual features in respect of electrical properties [5][6][7], magnetism [8][9][10][11][12][13][14], adsorption [15,16], NLO [17][18][19], and biological activity [20].…”