Structurally characterised new twisted conformer for cyclen, controlled by metal ion complexation as seen in Ni^II and Cu^II complexes with halides and pseudohalides

Abstract

Conformational flexibility of cyclen controlled by complexation with Ni(ii) and Cu(ii) as evidenced by structural studies.

Synthesis, X-ray structures, and magnetic properties of seven polynuclear Cu(ii) complexes containing pyrazole-3,5-dicarboxylate with various ancillary ligands

“…The structural self-assembly is governed by many factors such as metal ions, ligands, reaction temperature, counterions, solvents, and pH of the reaction. [7][8][9][10][11][12] The parameters that are most important for the magnetic property are the bridging ligand and the paramagnetic metal center. Changes in the type of metal center and bridging ligand result in the creation of materials with varying magnetic properties.…”

“…[39][40][41] Apart from H 3 pzdc, the ancillary ligands can influence the structural diversity and crystal packing resulting in products with varying magnetic properties. Herein, a series of polynuclear Cu(II) complexes based on the pyrazole-3,5-dicarboxylic ligand and various ancillary ligands were successfully synthesized, namely, (Him) 2 (6), and [Cu 3 (pzdc) 2 (en) 2 (H 2 O) 2 ] n (7) (where im = imidazole, amp = 4-aminopyridine, tmdp = 4,4 0 -trimethylenedipyridine, and en = ethylenediamine). The magnetic susceptibility of all complexes was investigated with magnetic model fitting.…”