Chiral cyanide-bridged 1D Fe~Ⅲ-Mn~Ⅲ heterobimetallic chains: Synthesis, structures and magnetic properties |
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基金项目: | financially supported by the Major State Basic Research Development Program (2011CB808704);the National Natural Science Foundation of China (91022031) |
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摘 要: | Two couples of enantiomerically pure chiral cyano-bridged heterobimetallic one-dimensional (1D) chain complexes: Mn((R,R)-Salphen)Fe(Tp)(CN)3]n (1) and Mn((S,S)-Salphen)Te(Tp)(CN)3]n (2) (Salphen = N,N’-1,2-diphenylethylenebis (salicylideneiminato) dianion, Tp = tris(pyrazolyl) hydroborate), Mn((R,R)-Salphen)Fe(Tp*)(CN)3·2H2O]n (3) and Mn((S,S)-Salphen)Fe(Tp*)(CN)3·2H2O]n (4) (Tp* = hydridotris (3,5-dimethylpyrazol-1-yl) borate), have been successfully synthesized by the reactions of MnIII schiff-base complexes with the tricyanometalate building block, (LTp)Fe(CN)3]- (LTp = Tp or Tp*). All complexes are made up of neutral cyano-bridged zigzag double chains with (-Fe-C≡N-Mn-N≡C-)n as the repeating unit. Circular dichroism (CD) spectra confirm the enantiomeric nature of the optically active complexes. Magnetic studies demonstrate that ferromagnetic interactions are operative in these complexes. The ferromagnetic couplings become weak in the chains with the bending of the Mn-N≡C angles.
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关 键 词: | chiral complexes cyanide ligands chain compounds crystal structures magnetic properties |
Chiral cyanide-bridged 1D FeIII-MnIII heterobimetallic chains: Synthesis, structures and magnetic properties |
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Authors: | MinXia Yao Qi Zheng Feng Gao YiZhi Li JingLin Zuo |
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Institution: | 1. State Key Laboratory of Coordination Chemistry; School of Chemistry and Chemical Engineering, Nanjing National Laboratory of Microstructures, Nanjing University, Nanjing, 210093, China
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Abstract: | Two couples of enantiomerically pure chiral cyano-bridged heterobimetallic one-dimensional (1D) chain complexes: Mn((R,R)-Salphen)Fe(Tp)(CN)3] n (1) and Mn((S,S)-Salphen)Te(Tp)(CN)3] n (2) (Salphen = N,N??-1,2-diphenylethylenebis (salicylideneiminato) dianion, Tp = tris(pyrazolyl) hydroborate), Mn((R,R)-Salphen)Fe(Tp*)(CN)3·2H2O] n (3) and Mn((S,S)-Salphen)Fe(Tp*)(CN)3·2H2O] n (4) (Tp* = hydridotris (3,5-dimethylpyrazol-1-yl) borate), have been successfully synthesized by the reactions of MnIII schiff-base complexes with the tricyanometalate building block, (LTp)Fe(CN)3]? (LTp = Tp or Tp*). All complexes are made up of neutral cyano-bridged zigzag double chains with (-Fe-C??N-Mn-N??C-) n as the repeating unit. Circular dichroism (CD) spectra confirm the enantiomeric nature of the optically active complexes. Magnetic studies demonstrate that ferromagnetic interactions are operative in these complexes. The ferromagnetic couplings become weak in the chains with the bending of the Mn-N??C angles. |
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Keywords: | chiral complexes cyanide ligands chain compounds crystal structures magnetic properties |
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