NDLI: Metal ions directing the geometry and nuclearity of azido-metal(II) complexes derived from bis(2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl)amine

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Louka, Febee R. Obaid, Yasser K. Massoud, Salah S. Fischer, Roland C. Mautner, Franz A. Vicente, Ramon Ribas, Joan
Description	Author Affiliation: Massoud SS ( Department of Chemistry, University of Louisiana at Lafayette, P.O. Box 44370, Lafayette, LA 70504, USA. ssmassoud@louisiana.edu)
Abstract	The reaction of a methanolic solution containing $M(ClO_{4})_{2}·nH_{2}O$ (M = Cu, Ni, Zn or Cd) or $CoCl_{2}·6H_{2}O$ with bis(2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl)amine (bedmpza) in the presence of $NaN_{3}$ afforded the complexes $[Cu(bedmpza)(μ_{1,1}-N_{3})]_{2}(ClO_{4})_{2}$ (1), $[Ni(bedmpza)(N_{3})(μ_{1,1}-N_{3})]_{2}·1.5H_{2}O$ (2), $[Co(bedmpza)(N_{3})_{2}]$ (3), $[Zn(bedmpza)(N_{3})]ClO_{4}$ (4) and $[Cd(bedmpza)(N_{3})(μ_{1,1}-N_{3})]_{2}·1.5H_{2}O$ (5). The five complexes were characterized by spectroscopic techniques and their molecular structures were determined by single crystal X-ray crystallography . The two mononuclear complexes 3 and 4 display distorted TBP and tetrahedral geometry, respectively with the azide ions acting as monodentate ligands . Doubly bridged end-on- azido dinuclear complexes were obtained in the remaining compounds. Compounds 2 and 5 are isomorphic with distorted octahedral geometry, whereas distorted square pyramidal geometry was determined in the Cu(II) complex 1. The magnetic properties for complexes 1 and 2 were investigated by measuring the magnetic susceptibilities at variable temperatures (300–2 K). The Ni(II) complex exhibits moderate ferromagnetic coupling, whereas $[Cu(bedmpza)(μ_{1,1}-N_{3})]_{2}(ClO_{4})_{2}$ (1) which contains two crystallographic independent dinuclear subunits in the unit cell, with different Cu–N(N3)–Cu bond angles, reveals different signs in the magnetic coupling. The complex represents the first example in the literature that has simultaneously two moieties with ferro- (J = 15.4 $cm^{−1})$ and antiferromagnetic (J = −18.9 $cm^{−1})$ interactions.
ISSN	14779226
Issue Number	11
Journal	Dalton Trans.
Volume Number	42
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-03-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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