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文报道了四种新的双核钴(Ⅱ)配合物,即[Co2(4Br-TPHA)(L)4](ClO4)(4Br-TPHA=四溴代对苯二甲酸根阴离子,L=1,10-菲咯啉(phen)(1),5-硝基-1,10-菲咯啉(NO2-phen)(2),2,2′-联吡啶(bpy)(3)和4,4′-二甲基-2,2′-联吡啶(Me2bpy)(4))的合成和表征,基于IR光谱、元素分析、电导测量等方法推定配合物具有四溴代对苯二甲酸根桥联结构和Co(Ⅱ)离子具有畸变的八面体配位环境,配合物的变温磁化率(75-300K)已测,其数据已用从自旋哈密顿算符H=-2JS1·S2导出的磁方程拟合,求得交换参数为J=-0.88cm-1(1),J=-0.86cm-1(2),J=-0.89cm-1(3),J=-0.90cm-1(4),表明金属离子间有弱的反铁磁性自旋变换相互作用。  相似文献   
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报导了四种新的双核钴(Ⅱ)配合物,即[Co2(4I-TPHA)(L)4](COl4)(4I-TPHA=四碘代对苯二甲酸根阴离子,L=1,10菲咯啉(phen)(1),5-硝基-,10菲咯啉(NO2-phen)(2),2,2′-联吡啶(bpy)(3)和4,4′-二甲基-2,2′-联吡啶(Me2bpy)(4)的合成和表征,配合物的磁性研究表明双核钴(Ⅱ)离子间有弱的反铁磁性自旋交换相互作用。  相似文献   
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草酸根桥联的钒氧铜配合物的合成、表征及抗肿瘤活性研究孙献茹程鹏廖代正*姜宗慧阎世平王耕霖(南开大学化学系天津300071)近年来,过渡金属配合物的合成及研究引起了人们极大的兴趣,并且其在药物方面的应用正在引起人们的重视[1]。本文报道了三个新的VO-...  相似文献   
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In order to shed light upon the nature and mechanism of 4f-3d magnetic exchange interactions, a series of binuclear complexes of lanthanide(3+) and chromium(3+) with the general formula [Ln(L)5(H2O)2Cr(CN)6]·mL· nH2O (Ln=La (1), Ce (2), Pr (3), Nd (4); x=5, y=2, m=1 or 2, n=2 or 2.5; L=2-pyrrolidinone) and [Ln(L)4(H2O)3Cr(CN)6] ·nH2O (Ln=Sm (5), Eu (6), Gd (7), Tb (8), Dy (9), Er (10); x=4, y=3, m=0, n= 1.5 or 2.0; L=2-pyrrolidinone) were prepared and the X-ray crystal structures of complexes 2, 6 and 7 were determined. All the compounds consist of a Ln-CN-Cr unit, in which Ln^3+ in a square antiprism environment is bridged to an octahedral coordinated Cr^3+ ion through a cyano group. The magnetic properties of the complexes 3 and 6-10 show an overall antiferromagnetic behavior. The fitting to the experimental magnetic susceptibilities of 7 give g= 1.98, J=0.40 cm^-1, zJ'= -0.21 cm^-1 on the basis of a binuclear spin system (Scd=7/2, Scr=3/2), revealing an intra-molecular Gd^3+-Cr^3+ ferromagnetic interaction and an inter-molecular antiferromagnetic interaction. For 7 the calculation of quantum chemical density functional theory (DFT), combined with the broken symmetry approach, showed that the calculated spin coupling constant was 20.3 cm^-1, supporting the observation of weak ferromagnetic intra-molecular interaction in 7. The spin density distributions of 7 in both the high spin ground state and the broken symmetry state were obtained, and the spin coupling mechanism between Gd^3+ and Cr^3+ was discussed.  相似文献   
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