title: Silver(I) sulfate coordination polymers with 4,4'-bipyridazine and pyridazino[4,5-d]pyridazine.
abstract: Poly[[micro(4)-4,4'-bipyridazine-micro(5)-sulfato-disilver(I)] monohydrate], [[Ag(2)(SO(4))(C(8)H(6)N(4))].H(2)O](n), (I), and poly[[aqua-micro(4)-pyridazino[4,5-d]pyridazine-micro(3)-sulfato-disilver(I)] monohydrate], [[Ag(2)(SO(4))(C(6)H(4)N(4))(H(2)O)].H(2)O](n), (II), possess three- and two-dimensional polymeric structures, respectively, supported by N-tetradentate coordination of the organic ligands [Ag-N = 2.208 (3)-2.384 (3) A] and O-pentadentate coordination of the sulfate anions [Ag-O = 2.284 (3)-2.700 (2) A]. Compound (I) is the first structurally examined complex of the new ligand 4,4'-bipyridazine; it is based upon unprecedented centrosymmetric silver-pyridazine tetramers with tetrahedral AgN(2)O(2) and trigonal-bipyramidal AgN(2)O(3) coordination of two independent Ag(I) ions. Compound (II) adopts a typical dimeric silver-pyridazine motif incorporating two kinds of square-pyramidal AgN(2)O(3) Ag(I) ions. The structure exhibits short anion-pi interactions involving noncoordinated sulfate O atoms [O...pi = 3.041 (3) A].
authors.affiliation: Inorganic Chemistry Department, Kiev University, Kiev, Ukraine. dk@univ.kiev.ua
authors.forename: Konstantin V
authors.initials: KV
authors.lastname: Domasevitch
authors.forename: Il'ya A
authors.initials: IA
authors.lastname: Gural'skiy
authors.forename: Pavlo V
authors.initials: PV
authors.lastname: Solntsev
authors.forename: Eduard B
authors.initials: EB
authors.lastname: Rusanov
authors.forename: Alexander N
authors.initials: AN
authors.lastname: Chernega