Metal–betaine interactions. Part 3. Crystal structures of polymeric diaquabis(betaine)disilver(I) dinitrate and bis(pyridine betaine)disilver(I) diperchlorate

Two polymeric silver(I) complexes of betaine (Me3+NCH2CO2–, L1) and pyridine betaine (C5H5-+NCH2CO2–, L2) have been prepared and characterized by X-ray Crystallography. The complexes [{Ag2L12(H2O)2(NO3)2}n]1 and [{Ag2L22(ClO4)2}n]2 are structurally similar, being composed of centrosymmetric carboxylato-bridged Ag2(carboxylato-O,O′)2 dimers (Ag–O 2.21–2.41 A) which are extended into a ‘stairs-like’ polymer through the co-ordination of each metal centre by a carboxylate oxygen atom [Ag–O 2.47–2.50 A] from an adjacent dimer. In addition, the primary co-ordinating sphere about the silver atom is completed by an aqua ligand [Ag–O 2.554(3)A] in complex 1 and by a perchlorate oxygen atom [Ag–O 2.415(3)A] in 2. The intra-dimer Ag ⋯ Ag distance is 2.898(1) for 1 and 2.814(2)A for 2, the latter being one of the shortest among known dinuclear silver(I) carboxylates.

[1]  C. Kennard,et al.  The crystal structure of silver(I) 2-hydroxybenzoate and silver(I) 2,6-dihydroxybenzoate , 1988 .

[2]  C. Kennard,et al.  Silver(I)–phenoxyalkanoates. The crystal and molecular structures of polymeric [(4-chloro-2-methylphenoxy)ethanoato-O,O′]silver(I), [(2,4-dichlorophenoxy)-ethanoato-O,O′]silver(I), and di-µ-[(2-chlorophenoxy)ethanoato-O,O′]-disilver(I)–silver(I) perchlorate (1/1) , 1988 .

[3]  C. Kennard,et al.  The Crystal-Structure of Silver(I) (2-Carbamoylphenoxy)Acetate , 1986 .

[4]  R. Rajaram,et al.  Structure of bis[μ-(β-alanine)-O,O']-disilver(I) dinitrate, [Ag2(C3H7NO2)2](NO3)2 , 1984 .

[5]  K. Harmon,et al.  Hydrogen bonding: Part 15. Infrared study of hydrogen bonding in betaine hydrate and betaine hydrofluoride , 1984 .

[6]  H. Hartl,et al.  catena-Bis(μ-benzoato-O,O',μ-O)-bis(pyridin)-disilber(I), [Ag2(C5H5N)2(C7H5O2)2] , 1983 .

[7]  Glen B. Deacon,et al.  Relationships between the carbon-oxygen stretching frequencies of carboxylato complexes and the type of carboxylate coordination , 1980 .

[8]  R. Griffin,et al.  Single Crystal Study of the 19F Shielding Tensors of a Trifluoromethyl Group , 1972 .

[9]  J. Rao,et al.  Crystal structure of glycine silver(I) nitrate , 1972 .

[10]  A. McPhail,et al.  X-Ray crystal structure of a dimeric silver(I) complex containing short metal–metal separations , 1972 .

[11]  R Diamond,et al.  Profile analysis in single crystal diffractometry. , 1969, Acta crystallographica. Section A, Crystal physics, diffraction, theoretical and general crystallography.

[12]  R. Huber,et al.  A method of absorption correction by X-ray intensity measurements , 1968 .

[13]  G. D. Rieck,et al.  International tables for X-ray crystallography , 1962 .

[14]  A. Blakeslee,et al.  The Structure of Silver Perfluorobutyrate1 , 1956 .