Synthesis and characterization of a stable paramagnetic hexacoordinated oxochromium(IV) complex with dianionic tetradentate schiff base ligand salen

Koley, Manjuri K. ; Manoharan, Periakaruppan T. ; Koley, Aditya P. (2010) Synthesis and characterization of a stable paramagnetic hexacoordinated oxochromium(IV) complex with dianionic tetradentate schiff base ligand salen Inorganica Chimica Acta, 363 (14). pp. 3798-3802. ISSN 0020-1693

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00201...

Related URL: http://dx.doi.org/10.1016/j.ica.2010.07.035

Abstract

A paramagnetic octahedral oxochromium(IV) complex with dianionic tetradentate ligand salen (where H2salen is N,N'-bis(salicylidene)-1,2-ethylenediamine) has been synthesized. This compound [CrO(OH2)(salen)] (1) is characterized by elemental analysis, magnetic moment measurement, IR, UV-Vis and EPR spectroscopic studies. Measured room temperature (RT) magnetic moment value is 2.96 BM for 1 indicates a d2 system with a triplet ground state. The magnetic moment value rules out a large spin-orbit coupling. The RT and LNT powder EPR spectra of 1 in X-band clearly shows two lines, one around g = 1.965 and the other with larger intensity at g = 4.26 ± 0.10. The first line at g = 1.965 corresponds to the |0> ↔ |± 1> transition from the Kramers doublet |± 1>, while the broad and intense line at low field with the g-value of 4.26 ± 0.10 is due to the forbidden transition |-1> ↔ |+1>. Compound 1 displays two successive reductions at -0.76 and -1.63 V (versus Ag/AgCl), respectively, while it undergoes only one irreversible oxidation as evident from the well-defined anodic wave at +1.48 V in its cyclic voltammogram.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Oxochromium(IV) Complex; Schiff Base Ligand; Salen; EPR and Electronic Spectra; Cyclic Voltammetry; Electrochemistry
ID Code:19879
Deposited On:22 Nov 2010 11:44
Last Modified:06 Jun 2011 12:03

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