Dimeric structures silver® compounds

Up to now, three silver(I) and one copper(I) complexes of Lag have been synthesized and crystallographically characterized. They display a variety of one- to three-dimensional frameworks based on coordination bonds as well as intermolecular S- S contacts. Reaction of AgC104 H20 and Lag in acetonitrile gave red brick crystals of [Ag(Lag)3]C104-CHaCN 2 (125). The compound has a dimeric structure... 

The 3 + 1 condensation of 7 with 2 gives the iodide salt 8. Anion exchange on 8 (X=I) with hfflU Fs gives 8 as the hexafluorophosphate salt. The combination of 8 (X=PF ) with four equivalents of AgaO gives the tetranuclear biscarbene dimer 9 (P). Compound 9 is a dimer con sed of a silver cluster that is stabilized by two cyclophanes. The structural bonding of 9 is similar to 6... 

Silver(I) complexes are known with the tris(pyrazolyl)borate [HB(pz)3] and the methyl, phenyl, bromo, or trifluoromethyl-substituted derivatives. The structure of the silver tri(pyrazolyl)borato species has been a puzzle since it was first reported.385,386 It was suggested that the structure could be oligomeric, but recently the crystal structure of the compound [Ag HB(3,5-Me2pz)3 ]2 shows that it has a dimeric structure387 where the silver(I) centers are tricoordinated by a bidentate arm of one ligand and a monodentate arm of the other ligand (29). The related complexes [Ag HB(4-Brpz)3 ]2, [Ag HB(4-Mepz)3 ]2, [Ag HB(3,5-Me2pz)3 ]2, [Ag HB(3-Mepz)3 ] , [Ag B(pz)4 ], and... 

The crystal structures of Ag(Gly)69 and Ag(HGly)NOs405 have been determined. For the latter compound, the silver ions bridged centrosymmetrically related carboxyl groups to form dimers of glycine. The actual composition was best represented as (NH3CH2C02 Ag+)2(NOi )2. Below —55 °C the compound was found to be ferroelectric. It was the first crystal containing either silver or the nitrate ion in which ferroelectridty was observed.406... 

Silver carboxylate compounds are fight-sensitive and generally insoluble in most solvents, making it difficult for their structural characterization. In contrast, the zwitteri-onic betaine ligands R3N+(CH2) C02 form stable silver complexes that are soluble in water and ethanol, and a variety of discrete dimers or polymeric chain/network stractures constracted by the linkage of dimeric subunits have been obtained. ... 

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