- 作者: Chi-How Penga, Chih-Chieh Wanga,b, Hsiao-Ching Leea, Wei-Chung Loa, Gene-Hsiang Leea and Shie-Ming Penga
- 作者服務機構: Department of Chemistry, National Taiwan University, Taipei, Taiwan, R.O.C.
- 中文摘要: Two new linear tri-nickel(II) complexes with an infinite polymeric chain, [Ni3(m3-dpa)4(C4O4Me)](BF4) 1 and [Ni3(m3-dpa)4(N3)](PF6) 2, [dpa- = di(a-pyridyl)amido anion], have been synthesized and their structures were determined by X-ray diffraction. Compound 1 crystallizes in the monoclinic system, space group C 2/c, with a = 19.9078(3), b = 13.2986(2), c = 37.6622(5) A, b = 94.091(1)°, Z = 8. Compound 2 crystallizes in the monoclinic system, space group P 21/n, with a = 13.323(4), b = 23.217(3), c = 17.528(5) A, b = 94.42(3)°, Z = 4. The two complexes are described as one-dimensional systems with the (C4O4Me)-, 1, or N3-, 2, serving as a m-(1,3) bridged ligand at the two axial sites of each [Ni3(m3-dpa)4]2+ fragment. The Ni-Ni distances of 2.400(1) and 2.402(1) in 1 and 2.389(2), 2.385(2) in 2 are obviously shorter than those of 2.4325(7), 2.4356(7) in the monomeric complex [Ni3(m3-dpa)4(N3)2] 3. The magnetic properties of complexes 2 and 3 were studied by susceptibility measurements vs temperature. The cM vs T plots of both complexes show a strong antiferromagnetic behavior. The simulated J13 values are -95 cm-1 and -97 cm-1 for 2 and 3, respectively
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