Magnetic Properties of Mixed Ligand Ni-2(II) and Ni-4(II) Complexes Composed of Macrocyclic Hexaamine-Dithiophenolato and Bridging Tetrazolato Ligands

作者：Lach Jochen; Voitekhovich Sergei V; Lozan Vasile; Gaponik Pavel N; Ivashkevich Oleg A; Lincke Joerg; Laessig Daniel; Kersting Berthold^*

来源：Zeitschrift fur Anorganische und Allgemeine Chemie, 2010, 636(11): 1980-1986.

DOI：10.1002/zaac.201000087

• Nickel
• Coordination chemistry
• Tetrazolato complexes
• Magnetic properties
• X-ray diffraction

The magnetic properties of the dinuclear and tetranuclear nickel(II) tetrazolato complexes [Ni2L(RCN4)][BPh4] (R = H (4), Me (5), Ph (6)) and [(Ni2L)(2)(1,4-(CN4)(2)-C6H4)][BPh4](2) (7), where (L)2 represents a 24-membered macrocyclic N6S2 supporting ligand, are reported. Analysis of temperature-dependent magnetic susceptibility measurements over the temperature range from 2 to 300 K revealed the presence of weak ferromagnetic exchange interactions between the Ni-II ions in the binuclear [Ni2L(mu-L')](+) subunits with magnetic exchange coupling constant values of J(1) = 13.5 cm(-1) for 4, J(1) = 20.0 cm(-1) for 5, J(1) = 19.2 cm(-1) for 6, and J(1) = 15.2 cm(-1) for 7 (H = 2JS(1)S(2)). The exchange coupling J(2) across the bistetrazolato bridge in 7 is less than 0.1 cm(-1), which suggests that no significant interdimer coupling occurs in this compound. The synthesis and crystal structure of the new complex 7.2MeCN is also reported.

• 出版日期2010-9