Nickel(II) Chain with Alternating End-On/End-to-End Single Azido Bridges : A Combined Structural, Magnetic, and Theoretical Study Article - 2008

Marie-Laure Bonnet, Christophe Aronica, Guillaume Chastanet, Guillaume Pilet, Dominique Luneau, Corine Mathonière, Rodolphe Clérac, Vincent Robert

Marie-Laure Bonnet, Christophe Aronica, Guillaume Chastanet, Guillaume Pilet, Dominique Luneau, Corine Mathonière, Rodolphe Clérac, Vincent Robert, « Nickel(II) Chain with Alternating End-On/End-to-End Single Azido Bridges : A Combined Structural, Magnetic, and Theoretical Study  », Inorganic Chemistry, 2008, pp. 1127-1133. ISSN 0020-1669

Abstract

The reaction of a tridentate Schiff base LH (L- : 1,1,1-trifluoro-7-(dimethylamino)-4-methyl-5-aza-3-hepten-2-onato) with a Ni(II) salt in the presence of azide salt has led to a new alternating end-on (EO)/end-to-end (EE) azidobridged Ni(II) chain of formula [Ni2(í1,1-N3)(í1,3-N3)(L)2(MeOH)2]n. Its originality lies in the presence of single EE and EO coordination modes for the azide. It crystallizes in the C2/c space group, a ) 21.570(7) Å, b ) 10.79(1) Å, c ) 16.154(5) Å, â ) 120.81(2)°, Z ) 4. The chain can be viewed as Ni2(N3)(L)2(MeOH)2+ dimeric units linked to each other in a zigzag pattern by the other azide. Magnetic susceptibility and magnetization measurements have been performed and revealed that the chain can magnetically be depicted as isolated Ni2(N3) units exhibiting antiferromagnetic interaction (JAF -37 cm-1). Ab initio calculations confirmed the efficient magnetic coupling through the EE bridge and vanishingly small EO Ni2(í1,1-N3) interactions.

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