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• W2008520425 abstract "Abstract Azido–Ni II complexes of dinuclear, [Ni 2 (trpn) 2 (μ 1,3 ‐N 3 ) 2 ](ClO 4 ) 2 ( 1 ), and monodimensional structures cis ‐[Ni(abap)(μ 1,3 ‐N 3 )] n (ClO 4 ) n ( 2 ) and cis ‐[Ni(Me 6 trien)(μ 1,3 ‐N 3 )] n (ClO 4 ) n · n H 2 O ( 3a ) as well as the monomer [Ni(Me 6 trien)(N 3 )]ClO 4 ( 3b ) {trpn = tris(3‐aminopropyl)amine; abap = N ‐(2‐aminoethyl)‐ N , N ‐bis(3‐aminopropyl)amine; Me 6 trien = 1,1,4,7,10,10‐hexamethyltriethylene tetramine} were synthesized and structurally characterized by spectroscopic techniques, X‐ray crystallography, and variable‐temperature magnetic measurements. In the complexes 1 – 3a , the ClO 4 – groups are counterions and the Ni 2+ centers are bridged by the azido ligands in an end‐to‐end bonding fashion. The coordination geometry around the Ni II ions is six‐coordinate with a distorted octahedral environment achieved by the four N atoms of the tetradentate amines and two terminal N atoms of the azide groups. Complex 1 consists of dinuclear units with doubly bridged azido groups whereas in 2 and 3a , a polymeric 1D chain is formed in which the adjacent azido groups link the Ni II centers in a cis arrangement. In complex 2 , the structural parameters of the two adjacent azido bridging ligands are different and an alternating 1D system with two different end‐to‐end azido bridges is produced. Complex 3a is a uniform 1D system where the strong steric hindrance imposed by the methyl groups of the Me 6 trien ligand [diagonal N(azide)–Ni–N(amine) bond angles] causes pronounced deviation from the ideal octahedral geometry. Complex 3b exhibits a distorted square pyramidal geometry. The complexes 1 – 3a show antiferromagnetic coupling. In complex 1 , the exchange coupling constant was J = –64(1) cm –1 , whereas in the polynuclear species 2 and 3a , the calculated values were J 1 = –63.7(2) ( α = 0.52) and J = –26.8(1) cm –1 , respectively. The magnetic parameters have been correlated to the structural data.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)" @default.
• W2008520425 created "2016-06-24" @default.
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• W2008520425 date "2007-03-01" @default.
• W2008520425 modified "2023-09-26" @default.
• W2008520425 title "Dinuclear and Polynuclear Bridged Azido–Nickel(II) Complexes: Synthesis, Structure Determination, and Magnetic Properties" @default.
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• W2008520425 doi "https://doi.org/10.1002/ejic.200600725" @default.
• W2008520425 hasPublicationYear "2007" @default.
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