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Long-Range Ferromagnetic Ordering in Two-Dimensional Coordination Polymers Co[N(CN)2]2(L) [L = Pyrazine Dioxide (pzdo) and 2-Methyl Pyrazine Dioxide (mpdo)] with Dual m- and m3-[N(CN)2] Bridges

Long-Range Ferromagnetic Ordering in Two-Dimensional Coordination Polymers Co[N(CN)2]2(L) [L = Pyrazine Dioxide (pzdo) and 2-Methyl Pyrazine Dioxide (mpdo)] with Dual m- and m3-[N(CN)2] Bridges. Sun, Hao-Ling; Gao, Song; Ma, Bao-Qing; Su, Gang (College of Chemistry and Molecular Engineering, State Key Laboratory of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, Peop. Rep. China). Inorganic Chemistry, 42(17), 5399-5404 (English) 2003 American Chemical Society. CODEN: INOCAJ. ISSN: 0020-1669. DOCUMENT TYPE: Journal CA Section: 78 (Inorganic Chemicals and Reactions) Section cross-reference(s): 75, 77 Two novel coordination polymers of Co(II) with dicyanamide (dca) were obtained by the addn. of ancillary ligands of pyrazine dioxide (pzdo) and 2-Mepyrazine dioxide (mpdo) into the Co-dca binary system. Co[N(CN)2]2(pzdo) (1) crystallizes in the orthorhombic space group of Pnnm (No. 58) with a 9.4699(5), b 14.9984(3), c 7.4313(7) ?, and Z = 4, while Co[N(CN)2]2(mpdo) (2) is in the monoclinic space group C2 with a 16.5391(4), b 9.6065(2), c 7.5001(2) ?, b 105.779(1)°, and Z = 4. Both complexes contain similar two-dimensional triangular Co-dca layers, which offer rare examples of mixed 1,5-m- and m3-dca bridging coordination polymers with long-range ferromagnetic ordering f2.5 K.

Titanium-based molecular squares and rectangles: Syntheses by self-assembly reactions of titanocene fragments and aromatic N-heterocycles

Titanium-based molecular squares and rectangles: Syntheses by self-assembly reactions of titanocene fragments and aromatic N-heterocycles. Kraft, Susanne; Hanuschek, Edith; Beckhaus, Ruediger; Haase, Detlev; Saak, Wolfgang (Institut fuer Reine und Angewandte Chemie Fakultaet fuer Mathematik und Naturwissenschaften Carl von Ossietzky Universitaet Oldenburg Postfach 2503, Oldenburg 26111, Germany). Chemistry--A European Journal, 11(3), 969-978 (English) 2005 Wiley-VCH Verlag GmbH & Co. KGaA. CODEN: CEUJED. ISSN: 0947-6539. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) Section cross-reference(s): 75, 77 This paper reports on the potential of titanium compds. as building blocks for supramol. polygons. Self-assembly reactions of low-valent titanocene units and N-heterocyclic bridging ligands lead to novel titanium-based supramol. squares. 13032-12-7 which is the cas registry number of one of substances is just one of reagents here. Pyrazine, 4,4'-bipyridine, and 1,2,4,5-tetrazine were used as bridging ligands, and the acetylene complexes [Cp2Ti{h2-C2(SiMe3)2}] and [(tBuCp)2Ti{h2-C2(SiMe3)2}] as sources of titanocene fragments. Mol. rectangles can be synthesized by stepwise redn. of the titanocene dichlorides [Cp2TiCl2] and [(tBuCp)2TiCl2] and consecutive coordination of two different bridging ligands. The resulting complexes are the first examples of mol. rectangles contg. bent metallocene corner units. Single-crystal x-ray analyses of the tetranuclear compds. revealed the geometric properties of the mol. polygons in the solid state. Comparison of bond lengths and angles in coordinated and free ligands reveals the reduced state of the bridging ligand in the low-valent titanium compds. The syntheses and properties of these novel, highly air- and moisture-sensitive compds. are discussed. .