Synthesis, crystal structure, EPR and electrochemical studies of copper(II) dipicolinate complex with 2,2 '-dipyridylamine ligand


Ucar I., Bulut A., Buyukgungor O.

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, cilt.68, sa.12, ss.2271-2277, 2007 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 68 Sayı: 12
  • Basım Tarihi: 2007
  • Doi Numarası: 10.1016/j.jpcs.2007.06.017
  • Dergi Adı: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2271-2277
  • Anahtar Kelimeler: organometallic compounds, X-ray diffraction, crystal structure, electron paramagnetic resonance (EPR), PYRIDINE-2,6-DICARBOXYLIC ACID, MOLECULAR-STRUCTURE, CHEMISTRY
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

The (2,2'-dipyridylamine)(pyridiiie-2,6-dicarboxylato)copper(II) trihydrate complex was synthesized and characterized by spectroscopic (IR, UV-vis, EPR), X-ray diffraction technique and electrochemical methods. The copper(II) center is surrounded by one bidentate 2,2'-dipyridylamine (dpa) and one tridentate dipicolinate (dpc) ligand, Lind exhibits a distorted square-pyramidal geometry. The crystal packing involves both hydrogen-bonding and pi-pi interactions. The solvent water molecules link monomers to one another through hydrogcn-bonding interactions, forming ladder-type chains in the ab plane. pi-pi interactions also occur between the dpa rings of neighboring molecules and are responsible for interchain packing. Based on EPR and optical absorption studies, spin-Hamiltonian and bonding parameters have been calculated. The g-values, calculated for title complex in polycrystalline state at 298 K and in frozen DNIF (I 10 K), indicate the presence of the unpaired electron in the d,(x2-x2) orbital. The evaluated metal-ligand bonding parameters showed strong in-plane sigma- and pi-bonding. The cyclic voltammogram of the title complex investigated in DMF (dimethylformamide) solution exhibits only metal centered electroactivity in the potential range +1.25 V versus Ag/AgCl reference electrode. (c) 2007 Elsevier Ltd. All rights reserved.