STRONTIUM IONS BRIDGED BY PYRAZINE-2,5-DICARBOXYLIC ACID AND WATER MOLECULES MAKE A THREE-DIMENSIONAL POLYMERIC STRUCTURE OF TRIAQUOMONO (μ-PYRAZINE-2,5-DICARBOXYLATO) STRONTIUM(II) DIHYDRATE CRYSTALS
Titel:
STRONTIUM IONS BRIDGED BY PYRAZINE-2,5-DICARBOXYLIC ACID AND WATER MOLECULES MAKE A THREE-DIMENSIONAL POLYMERIC STRUCTURE OF TRIAQUOMONO (μ-PYRAZINE-2,5-DICARBOXYLATO) STRONTIUM(II) DIHYDRATE CRYSTALS
Auteur:
Ptasiewicz-bak, H. Leciejewicz, J.
Verschenen in:
Journal of coordination chemistry
Paginering:
Jaargang 44 (1998) nr. 3-4 pagina's 237-246
Jaar:
1998-07-01
Inhoud:
Triaquo(μ-pyrazine-2,5-dicarboxylato)strontium(II) djhydrate, SrC6HI2N2O9 crystallizes in the triclinic system, space group PI, a = 6.238(l)Å, b = 9.418(2)Å, c= 10.591(2)Å, a = 73.58(3)°, β = 80.52(3)°, γ = 75.01(3)°, Z = 2. The structure is polymeric. Strontium ions are bridged by pyrazine-2,5;dicarboxylic acid molecules which use both (N,O)-bonding moieties (mean Sr-O = 2.567(3) Å, mean Sr-N = 2.826(3) Å). In addition, the bridging is accomplished by two oxygen atoms from water molecules (mean Sr-O = 2.681(3) Å) and bidentate oxygen atoms (Sr-O = 2.697(3) Å) from a carboxylic group of a pyrazine-2,5-dicarboxylic acid molecule. As a result, a three-dimensional molecular framework is formed. The coordination around the Sr ion is ninefold: seven oxygen and two nitrogen atoms make a distorted, mono-capped square antiprism. Two water molecules per unit cell are situated in the holes of this framework and participate in an extended hydrogen bond scheme.
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