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Title: XAFS Study of the Ferro- and Antiferromagnetic Binuclear Copper(II) Complexes of Azomethine Based Tridentate Ligands

Abstract

Binuclear copper complexes are known to be models for metalloenzymes containing copper active sites, and some of them are of considerable interest due to their magnetic and charge transfer properties. The reactions of the complex formation of bibasic tridentate heterocyclic imines with copper acetate leads to two types of chelates with mono deprotonated ligands and with totally deprotonated ligands. Cu K-edge EXAFS has been applied to determine the local structure around the metal center in copper(II) azomethine complexes with five tridentate ligands: 1-(salycilideneimino)- or 1-(2-tosylaminobenzilideneimino)-2-amino(oxo, thio)benzimidazoles. It has been found that some of the chelates studied are bridged binuclear copper complexes, and others are mononuclear complexes. The copper-copper interatomic distances in the bridged binuclear copper complexes were found to be 2.85-3.01 A. Variable temperature magnetic susceptibility data indicate the presence of both ferromagnetic and antiferromagnetic interactions within the dimer, the former is dominating at low temperatures and the latter at high temperatures.

Authors:
 [1];  [2]; ; ; ; ;  [3];  [1]
  1. Institute of Physics, Rostov State University, Stachki Ave., 194, 344090, Rostov-on-Don (Russian Federation)
  2. (Russian Federation)
  3. Institute of Physical and Organic Chemistry, Rostov State University, Stachki Ave., 194/2, 344090, Rostov-on-Don (Russian Federation)
Publication Date:
OSTI Identifier:
21054627
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 882; Journal Issue: 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644524; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; ACETATES; ANTIFERROMAGNETISM; BENZIMIDAZOLES; CHELATES; COPPER; COPPER COMPLEXES; COPPER IONS; CRYSTAL STRUCTURE; DIMERS; FERROMAGNETISM; FINE STRUCTURE; IMINES; INTERATOMIC DISTANCES; LIGANDS; MAGNETIC SUSCEPTIBILITY; TEMPERATURE DEPENDENCE; X-RAY SPECTROSCOPY

Citation Formats

Vlasenko, Valery G., Institute of Physical and Organic Chemistry, Rostov State University, Stachki Ave., 194/2, 344090, Rostov-on-Don, Vasilchenko, Igor S., Shestakova, Tatiana E., Uraev, Ali I., Burlov, Anatolii S., Garnovskii, Alexander D., and Pirog, Irina V. XAFS Study of the Ferro- and Antiferromagnetic Binuclear Copper(II) Complexes of Azomethine Based Tridentate Ligands. United States: N. p., 2007. Web. doi:10.1063/1.2644524.
Vlasenko, Valery G., Institute of Physical and Organic Chemistry, Rostov State University, Stachki Ave., 194/2, 344090, Rostov-on-Don, Vasilchenko, Igor S., Shestakova, Tatiana E., Uraev, Ali I., Burlov, Anatolii S., Garnovskii, Alexander D., & Pirog, Irina V. XAFS Study of the Ferro- and Antiferromagnetic Binuclear Copper(II) Complexes of Azomethine Based Tridentate Ligands. United States. doi:10.1063/1.2644524.
Vlasenko, Valery G., Institute of Physical and Organic Chemistry, Rostov State University, Stachki Ave., 194/2, 344090, Rostov-on-Don, Vasilchenko, Igor S., Shestakova, Tatiana E., Uraev, Ali I., Burlov, Anatolii S., Garnovskii, Alexander D., and Pirog, Irina V. Fri . "XAFS Study of the Ferro- and Antiferromagnetic Binuclear Copper(II) Complexes of Azomethine Based Tridentate Ligands". United States. doi:10.1063/1.2644524.
@article{osti_21054627,
title = {XAFS Study of the Ferro- and Antiferromagnetic Binuclear Copper(II) Complexes of Azomethine Based Tridentate Ligands},
author = {Vlasenko, Valery G. and Institute of Physical and Organic Chemistry, Rostov State University, Stachki Ave., 194/2, 344090, Rostov-on-Don and Vasilchenko, Igor S. and Shestakova, Tatiana E. and Uraev, Ali I. and Burlov, Anatolii S. and Garnovskii, Alexander D. and Pirog, Irina V.},
abstractNote = {Binuclear copper complexes are known to be models for metalloenzymes containing copper active sites, and some of them are of considerable interest due to their magnetic and charge transfer properties. The reactions of the complex formation of bibasic tridentate heterocyclic imines with copper acetate leads to two types of chelates with mono deprotonated ligands and with totally deprotonated ligands. Cu K-edge EXAFS has been applied to determine the local structure around the metal center in copper(II) azomethine complexes with five tridentate ligands: 1-(salycilideneimino)- or 1-(2-tosylaminobenzilideneimino)-2-amino(oxo, thio)benzimidazoles. It has been found that some of the chelates studied are bridged binuclear copper complexes, and others are mononuclear complexes. The copper-copper interatomic distances in the bridged binuclear copper complexes were found to be 2.85-3.01 A. Variable temperature magnetic susceptibility data indicate the presence of both ferromagnetic and antiferromagnetic interactions within the dimer, the former is dominating at low temperatures and the latter at high temperatures.},
doi = {10.1063/1.2644524},
journal = {AIP Conference Proceedings},
number = 1,
volume = 882,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}