Crystal Structure and Magnetic Interactions in Nickel(II) Dibridged Complexes Formed by Two Azide Groups or by Both Phenolate Oxygen-Azide, -Thiocyanate, -Carboxylate, or -Cyanate Groups
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- 作者：Subrata Kumar Dey ; Nijhuma Mondal ; M. Salah El Fallah ; Ramon Vicente ; Albert Escuer ; Xavier Solans ; M. Font-Bardí ; a ; T. Matsushita ; V. Gramlich ; and Samiran Mitra
- 刊名：Inorganic Chemistry
- 出版年：2004
- 出版时间：April 5, 2004
- 年：2004
- 卷：43
- 期：7
- 页码：2427 - 2434
- 全文大小：220K
- 年卷期：v.43,no.7(April 5, 2004)
- ISSN：1520-510X
文摘
Tridentate/tetradentate Schiff base ligands L1 and L2, derived from the condensation of o-vanillin or pyridine-2-aldehyde with N,N-dimethylethylenediammine, react with nickel acetate or perchlorate salt and azide, cyanate, orthiocyanate to give rise to a series of dinuclear complexes of formulas [Ni(L1)(
1,1-N3)Ni(L1)(N3)(OH2)]·H2O (1),{[Ni(L1)(1,1-NCS)Ni(L1)(NCS)(OH2)][Ni(L1)(-CH3COO)Ni(L1)( NCS) (OH2)]} (2) {[2A][2B]}, [Ni(L1)(1,1-NCO)Ni(L1)(NCO)(OH2)]·H2O (3), and [Ni(L2-OMe)(1,1-N3)(N3)]2 (4), where L1 = Me2N(CH2)2NCHC6H3(O-)(OCH3) and L2= Me2N(CH2)2NCHC6H3N. We have characterized these complexes by analytical, spectroscopic, and variable-temperature magnetic susceptibility measurements. The coordination geometry around all of the Ni(II) centers is adistorted octahedron with bridging azide, thiocyanate/acetate, or cyanate in a 1,1 mode and 2-phenolate oxygenion for 1-3, respectively, or with a double-bridging azide for 4. The magnetic properties of the complexes werestudied by magnetic susceptibility (
M) versus temperature measurements. The M 
s T plot reveals that compounds1 and 4 are strongly ferromagnetically coupled, 3 shows a weak ferromagnetic behavior, and 2 is very weaklyantiferromagnetically coupled.
1,1-N3)Ni(L1)(N3)(OH2)]·H2O (1),{[Ni(L1)(1,1-NCS)Ni(L1)(NCS)(OH2)][Ni(L1)(-CH3COO)Ni(L1)( NCS) (OH2)]} (2) {[2A][2B]}, [Ni(L1)(1,1-NCO)Ni(L1)(NCO)(OH2)]·H2O (3), and [Ni(L2-OMe)(1,1-N3)(N3)]2 (4), where L1 = Me2N(CH2)2NCHC6H3(O-)(OCH3) and L2= Me2N(CH2)2NCHC6H3N. We have characterized these complexes by analytical, spectroscopic, and variable-temperature magnetic susceptibility measurements. The coordination geometry around all of the Ni(II) centers is adistorted octahedron with bridging azide, thiocyanate/acetate, or cyanate in a 1,1 mode and 2-phenolate oxygenion for 1-3, respectively, or with a double-bridging azide for 4. The magnetic properties of the complexes werestudied by magnetic susceptibility (M) versus temperature measurements. The M s T plot reveals that compounds1 and 4 are strongly ferromagnetically coupled, 3 shows a weak ferromagnetic behavior, and 2 is very weaklyantiferromagnetically coupled.