The Crystal Structure of Silver(I) Glycolate Hemihydrate

Abstract

The silver(1) complex with glycolic acid, [Ag2(HOCH2C02)2],.nH20, has been prepared and its structure determined by X-ray diffraction. The structure is based on a bis(carboxy1ato-0 , O ') dimer [Ag-0, 2.234(2), 2.253(2) A; Ag-Ag 2.88lO(9) A], extended in both the axial positions into a network polymer through two oxygens of a bidentate a-hydroxy carboxy residue [Ag-O(hydroxy), 2.607(2) A; Ag-O(carboxy), 2.456(2) A; 0-Ag-0, 63.45(5)']. In this respect, the complex is unique among silver(1) carboxylate dimers.

Template‐Controlled Assembly of Ditopic Catechol Phosphines: A Strategy for the Generation of Complexes of Bidentate Phosphines with Different Bite Angles

“…Similar distortions were reported by Smith et al [14] and suggest that the bismuth atom in 8 is best described as having an effective coordination number of seven and a capped trigonal prismatic coordination geometry. The increased size of the template center in relation to 7 is naturally reflected in a lengthening of the m 2 -O À Bi distances by some 0.4 .…”

“…The template sources used included various chlo-A C H T U N G T R E N N U N G rides of tri-and tetravalent main group elements (AlCl 3 , GaCl 3 , SiCl 4 , SnCl 4 , BiCl 3 ), as well as ZrCl 4 , chosen because of their known ability to form stable catecholate complexes. [13][14][15] Furthermore, aluminium and gallium are larger congeners of boron, whereas Ga III , thanks to its similar ion radius, is a mimic of Fe III , an important component in biological [16] and redox processes. [17] Last, but not least, zirconium oxide materials are receiving increasing interest as supports for palladium-based cross-coupling catalysts [18] and with regard to the application of tin compounds as cocatalysts during palladium-catalyzed carbonylation, [19] Pd/Sn bimetallic complexes might have interesting potential in catalysis.…”

The Crystal Structures of two Linearly Polymeric Copper(II) Complexes of 2, 2′-Bipyridine with threefold Glycolato and Oxalato Bridges

“…This elongation of the coordination polyhedron, due to a Jahn-Teller effect, is also observed in polymeric complexes containing lactato or 2-methyllactato ligands and 4,4Ј-bipyridine [26]. Additional deviation from ideal octahedral geometry is shown by the chelating angles, which range from 72.35 (11) (10) 82.01(9) N(11)-Cu(1)-O (11) 92.68(6)/95.06 (7) 172.61 (12) 96.74 (11) 172.70 (9) Ϫ N(11)-Cu(1)-O (21) 176.22(5)/179.55 (7) 93.36 (13) 176.83 (11) 97.14(10)…”

“…Ϫ 104.65 (12) 87.91 (10) 89.72 (8) Ϫ N(12)-Cu(1)-O (11) 164.39(6)/168.99 (7) 93.17 (13) 171.64 (11) 97.14(10) Ϫ N(12)-Cu(1)-O (21) 99.48(5)/98.57 (7) 173.88 (14) 96.98 (11) 176.15 (9) Ϫ…”

“…The coordination modes of the oxalato ligand, both in solution [5] and in the solid state [6], are accordingly well known. By contrast, the possibilities of α-hydroxycarboxylato anions as bridging ligands in polynuclear complexes have been much less thoroughly explored: a few scattered papers have reported the formation of the coordination polymers [Cu(HGLYO) 2 ] n [7], [Pb(HGLYO) 2 ] n [8], [Ag 2 (HGLYO) 2 ] n · 1 / 2 H 2 O [9], [Co(HGLYO) 2 ] n [10] and [Zn(HLACO) 2 ] n [11] (H 2 GLYO ϭ glycolic acid, H 2 LACO ϭ lactic acid), in which the only ligand is an α-hydroxycarboxylato anion, but it was only recently that Xiong et al [12] reported the preparation of (S-(-)-lactato)(isonicotinato)zinc(II), the first α-hydroxycarboxylato-bridged coordination polymer featuring a second bridging ligand.…”