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Gerard A. van Albada Wilberth J.J. Smeets Anthony L. Spek Jan Reedijk 《Journal of chemical crystallography》2000,30(7):441-444
The compound [Fe(bipym)33](CF3SO3)2 (in which bipym = 2,2-bipyrimidine) crystallizes in the space group P21/c, with a = 13.7641(11), b = 18.7557(19), c = 12.3627(11) Å, = 103.085(8)° and Z = 4. The low-spin Fe(II) atom is octahedrally surrounded by six nitrogen atoms of three bipyrimidine groups with Fe—N distances that vary from 1.968(4) to 1.975(4) å. In the far-infrared region the Fe—N vibrations are observed at 359 and 372 cm-1. 相似文献
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Alexander Jakob 《Journal of organometallic chemistry》2008,693(23):3479-3489
2,2′-Bipyrimidine metal complexes with Ti, Mo, Fe, Ru, Pt, Ag, and Cu transition metal atoms have been synthesized and structurally characterized. These molecules were prepared by following synthesis methodologies. The reaction of 2,2′-bipyrimidine (1; bipym) with {[Ti](μ-σ,π-CCSiMe3)2}AgOTf ([Ti] = (η5-C5H4SiMe3)2Ti, OTf = OSO2CF3) (2) in a 1:1 molar ratio gave [{[Ti](μ-σ,π-CCSiMe3)2}Ag(bipym)]OTf (3) which on further treatment with another equivalent of 2 produced [({[Ti](μ-σ,π-CCSiMe3)2}Ag)2(μ-1,2,3,4-bipym)](OTf)2 (4). As consequence thereof, the coordination number of Ag(I) was changed from 3 to 4. A platinum-bipym complex with two acetylide substituents was accessible by the gradual reaction of 1 with K2[PtCl4] (5) and two equivalents of HCCR (7a, R = SiMe3; 7b, R = Fc; 7c, R = Rc; Fc = (η5-C5H4)(η5-C5H5)Fe; Rc = (η5-C5H4)(η5-C5H5)Ru) in di-iso-propylamine and in presence of [CuI]. Originating from cis-[(bipym)Pt(CCR)2] (8a, R = SiMe3; 8b, R = Fc; 8c, R = Rc) diverse multinuclear complexes with two, three or four different transition metals could be obtained. These are: [((CO)4Mo)(μ-1,2,3,4-bipym)Pt(CCFc)2] (10), [(AgClO4)(μ-1,2,3,4-bipym){[Pt(μ-σ,π-CCFc)2]AgOClO3}] (12), [(McCC)2Pt(μ-1,2,3,4-bipym)({[Ti](μ-σ,π-CCSiMe3)2}M)]X (15a, Mc = Fc, M = Cu, X = PF6; 15b, Mc = Rc, M = Cu, X = PF6; 15c, Mc = Fc, M = Ag, X = ClO4), and [(McCC)2Pt(μ-1,2,3,4-bipym)PtCl2] (17). Like other organometallic Pt-Ag tweezer complexes, compound 12 decomposed to give FcCC-CCFc (13). During prolonged stirring of 15a and 15b, respectively, [(McCC)2Pt(μ-1,2,3,4-bipym)({[Ti](μ-σ,π-CCSiMe3)(μ-σ,π-CCH)}M)]X (15′a, M = Cu, X = PF6; 15′b, M = Cu, X = PF6) was formed.The structures of 8b, 8c, 15a′, and 15b′ in the solid state are reported. All complexes exhibit the anticipated planar dinuclear Pt-M structure (M = Pt, Cu, Ag) with the 2,2′-bipyrimidine unit in a μ-1,2,3,4-bridging mode.Electrochemical investigations were carried out with 8a, 8b, and 8c and show that no significant influence of R on the bipym redox potentials exists. The typical redox behavior for the bipym, ferrocene, ruthenocene units and platinum were observed. 相似文献
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Vlasoula Bekiari Catherine P. Raptopoulou Panagiotis Lianos 《Journal of luminescence》2008,128(3):481-488
The photophysical behavior of 2,2′-bipyrimidine has been studied alone and in the presence of several lanthanide or other metal ions. This substance, which is employed as bridging ligand in homo- and hetero-dinuclear complexes, can form stable complexes with luminescent lanthanide ions like Eu3+ and Tb3+. Complexes precipitated from common solvents are crystalline with a structure that consists of discrete, centrosymmetric dinuclear entities with a planar ligand configuration. These complexes are strongly luminescent. Luminescence is sensitized by ligand-to-metal energy transfer. However, when the ligand and metal ions are mixed in an unconventional solvent, like a poly(ethylene glycol) oligomer, all reagents stay in solution and produce a different type of complex where only an enhanced ligand-centered fluorescence can be observed. It is possible that such fluorescence is emitted by 2,2′-bipyrimidine in a non-planar configuration. This behavior has also been observed with other heterocyclic ligands that can exist in different conformers, like terpyridine, and it may explain why some ligand-lanthanide complexes sometimes fail to sensitize efficient photoluminescence. 相似文献
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