Copper(II) bromide and copper(II) acetate complexes of 4,4′-(p- phenylene)bipyridazine

Anna S. Degtyarenko, Pavlo V. Solntsev, Eduard B. Rusanov, Alexander N. Chernega, Konstantin V. Domasevitch

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4,4′-(p-Phenyl-ene)bipyridazine, C14H10N4, (I), and the coordination compounds catena-poly[[dibromidocopper(II)] - 4,4′-(p-phenyl-ene) bipyridazine-2 N 2:N 2′], [CuBr2(C14H10N4)] n , (II), and catena-poly[[[tetra-kis(-acetato-2 O:O′)-dicopper(II)] - 4,4′-(p-phenyl-ene)bipyridazine-2 N 1:N 1′] chloro-form disolvate], {[Cu2(C2H3O2)4(C14H10N4)]·2CHCl3}n , (III), contain a new extended bitopic ligand. The combination of the p-phenyl-ene spacer and the electron-deficient pyridazine rings precludes C - H⋯π inter-actions between the lengthy aromatic mol-ecules, which could be suited for the synthesis of open-framework coordination polymers. In (I), the mol-ecules are situated across a center of inversion and display a set of very weak inter-molecular C - H⋯N hydrogen bonds [3.399 (3) and 3.608 (2) Å]. In (II) and (III), the ligand mol-ecules are situated across a center of inversion and act as N 2,N 2′-bidentate [in (II)] and N 1,N 1′-bidentate [in (III)] long-distance bridges between the metal ions, leading to the formation of coordination chains [Cu - N = 2.005 (3) Å in (II) and 2.199 (2) Å in (III)]. In (II), the copper ion lies on a center of inversion and adopts CuN2Br4 (4+2)-coordination involving two long axial Cu - Br bonds [3.2421 (4) Å]. In (III), the copper ion has a tetra-gonal pyramidal CuO4N environment. The uncoordinated pyridazine N atom and two acetate O atoms provide a multiple acceptor site for accommodation of a chloroform solvent mol-ecule by trifurcated hydrogen bonding [C - H⋯O(N) = 3.298 (5)-3.541 (4) Å].

Original languageEnglish (US)
Pages (from-to)m254-m258
JournalActa Crystallographica Section C: Crystal Structure Communications
Issue number7
StatePublished - 2008
Externally publishedYes


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