Wydział Chemii

Danuta Dobrzyńska

Lucjan B. Jerzykiewicz

Marek Duczmal

Agnieszka Wojciechowska

2011

Polyhedron

30

2684-2689

10.1016/j.poly.2011.07.018

Naukowa

Angielski

Artykuł

The new complex of chromium (III) with quinoline-2-carboxylate ion, [Cr(quin-2-c)₂ClMeOH]·MeOH (1), has been synthesized and its structure has been established by single crystal X-ray diffraction studies. The spectroscopic (IR, UV–Vis) and magnetic study have been undertaken. The chromium ion is coordinated by ClN₂O₃ donor set of pseudoctahedral geometry. The structure of 1 consists of hydrogen-bonded dimers which are further connected by weaker C–H⋯O bonds and C–H⋯Cl interactions into the layers. The layers are held together by the aromatic π⋯π contacts. The electronic experimental energies of d–d transitions are comparable with values calculated for crystal field parameters Dq = 1669, Ds = 705, and B = 684 cm⁻¹. The splitting of the d-d bands was observed by applying the filtration process. Magnetization measurements revealed the occurrence of weak antiferromagnetic interactions together with zero field splitting effects. The appearance of magnetic exchange between distant Cr(III) ions (Cr⋯Cr separation >6 Å) was ascribed to hydrogen bond extension of carboxylate ligands.

Chromium(III), crystal structure, Quinoline-2-carboxylate ligand, H-bonds mediated magnetic interactions

https://doi.org/10.1016/j.poly.2011.07.018

http://www.elsevier.com