Agnieszka Czylkowska

A novel carboxylic coordination polymer of samarium(III): [Sm(H 2 O)(4,4′-bipyridine)(CCl 2 HCOO) 3 ] n

A novel mixed ligand complex [Sm(H2O)(4,4′-bpy)(CCl2HCOO)3]n has been synthesized and characterized by elemental and thermal analysis, IR and conductivity studies. A coupled TG–MS system was used to monitor principal volatile fragments evolved during pyrolysis. The crystal and molecular structure of the complex was determined. The samarium atom is nine coordinated by two oxygen atoms from one chelating tridentate dichloroacetate ligand, four oxygen atoms from four bidentate bridging dichloroacetate groups, one oxygen atom from a bridging tridentate dichloroacetate ligand, one water molecule and one nitrogen atom from 4,4′-bipyridyl. The coordination polyhedron can be described as tricapped trigonal prism, distorted towards a capped tetragonal antiprism. Molecules are linked up by O–H···N hydrogen bonds and stacking interactions to give a two-dimensional net.

Coordination polymer of lanthanum: synthesis, properties and crystal structure of [La(4,4′-bipyridine)(CCl2HCOO)3(H2O)] n

A new mixed ligand complex of general formula [La(H2O)(4,4′-bpy)(CCl2HCOO)3] n has been synthesized and characterized by elemental and thermal analysis, IR spectroscopy and conductivity studies. The crystal and molecular structure was determined. The lanthanum atom is ten coordinate by four oxygen atoms from two chelating tridentate dichloroacetate substituents, two oxygen atoms from two bidentate bridging dichloroacetate groups, two oxygen atoms from two bridging tridentate dichloroacetate substituent, one oxygen atom of water molecule and one nitrogen atom from 4,4′-bipyridyl substituent. The coordination polyhedron of central atom can be described as tetradecahedron. The molecules are built up by O–H ··· N hydrogen bonds to a two-dimensional network.

Synthesis, Characterization and Molecular structure of bis(2,2′-Bipyridine-N,N′)Bis(Monochloroacetato-O) Manganese(II) Dihydrate

[Mn(2-bpy)2(mcac-O)2]·2H2O (2-bpy = 2,2′-bipyridine, mcac = ClCH2COO−) has been synthesized and characterized by elemental and thermal analysis, IR, magnetic and conductivity studies. It crystallizes in space group P21/n. The manganese atom adopts a significantly distorted square bipyramidal coordination. Mn–O bonds are distinctly stronger than Mn–N bonds. Molecules of the title compound are linked by strong hydrogen bonds O–H…O(acetate) to form an infinite hydrogen-bonded chain. The hydrogen-bonded chains are assembled via weak C–H…O hydrogen bonds leading to a three-dimensional net structure.