Synthesis and characterization of nickel(II) complexes of di-N-alkylated 14-membered tetraaza macrocycles containing cyclohexane rings via regioselective alkylation reaction

被引:15
作者
Kang, SG [1 ]
Kim, MS
Whang, DM
Kim, K
机构
[1] Taegu Univ, Dept Chem, Kyungsan 712714, South Korea
[2] Pohang Univ Sci & Technol, Dept Chem, Pohang 790784, South Korea
[3] Pohang Univ Sci & Technol, Ctr Biofunct Mol, Pohang 790784, South Korea
关键词
macrocyclic complexes; nickel complexes; crystal structures;
D O I
10.1016/S0020-1693(98)00123-6
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Square-planar nickel(II) complexes of new di-hr-alkylated 14-membered tetraaza macrocycles 6,17-dimethyl (L-5), 6,17-diethyl (L-6), and 6,17-bis(n-propyl) (L-7) derivatives of 3,14-dimethyl-2,6,13,17-tetraazatricyclo-[16.4.0.(1,18)0.(7.12)]docosane (L-1) have been prepared by onestep, regioselective reaction of [NiL1](2+) with R-I (R = Me, Et, or n-Pr) in basic Me2SO solutions. The nickel(II) complexes were characterized by H-1 and C-13 NMR spectroscopy and/or by single crystal X-ray crystallography. Crystal structures of [NiL1] (ClO4)(2) and the di-N-propyl derivative [NiL7] (ClO4)(2) show that the two complexes have normal square-planar coordination geometries with the nickel atoms lying on the N-4 planes; however, the Ni-N bond distances of the latter are about 0.03 Angstrom longer than those of the former. The electronic spectra, redox potentials and/or structures of the nickel(II) complexes are strongly affected by the presence of N- and C-substituents, but little affected by the nature of the N-alkyl groups. (C) 1998 Elsevier Science S.A. All rights reserved.
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页码:238 / 242
页数:5
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