Síntese e caracterização de cloro[ácido 2-(difenilfosfino)benzóico]-ouro(I) e alguns de seus derivados

Abstract

Recebido em 23/4/97; aceito em 17/12/97 SYNTHESIS AND CHARACTERIZATION OF NEW GOLD (I) PHOSPHINE COMPLEXES. In this contribution a few new gold(I)phosphine complexes, [2-(PPh 2)C 6 H 4 CO 2 H]AuX (where X = Cl, SCN, Br 3) and a similar gold(III) derivative [{2-(PPh 2)C 6 H 4 CO 2 H}Au III Cl (C 6 H 4 CH 2 NMe 2)]Cl have been synthesised and characterised. The phosphine, 2-(diphenylphosphino)benzoic acid, has been employed for the first time in gold chemistry. This ligand is potentially bidentate through bonding of the phosphine and carboxylate groups. The X-ray structure of the complex chloro[2-(diphenylphosphino) benzoic acid]gold(I) has been elucidated and the bond lengths encountered show great similarity to those of chloro(triphenylphosphine)gold(I). [2-(PPh 2)C 6 H 4 CO 2 H]AuCl crystallises in the space group P2 1 /c with a = 9.113(2) Å, b = 10.925(2) Å, c = 23.069(4) Å, β = 99.95 o (3), V = 2299 Å 3 , Z = 4 and R = 0.091. Biological tests for anti-fungal and anti-bacterial activity demostrate that [2-(PPh 2)C 6 H 4 CO 2 H]AuCl exhibits broad spectrum activity against a range of organisms.

Self‐Assembly in Gold(I) Chemistry: A Double‐Stranded Polymer with Interstrand Aurophilic Interactions

“…Here we show that a simple condensation procedure can lead to the self‐assembly of a cyclic dimer or trimer, or of a linear polymer for gold( I ) complexes of the three isomers of diphenylphosphanylbenzoic acid, and that the polymer forms a remarkable double‐stranded structure through aurophilic attractions. The ligands themselves are already known to give interesting gold compounds13, 14 and bimetallic compounds,15 and this work further highlights their potential in the field of hybrid organic–inorganic molecular materials.…”

“…The synthetic strategy was to eliminate HCl from the ortho ( 1 ), meta ( 2 ), and para ( 3 ) isomers of [AuCl(Ph 2 PC 6 H 4 CO 2 H)],13, 14 to yield the corresponding oligomers or polymers [{Au(Ph 2 PC 6 H 4 CO 2 )} n ], with the expectation that the degree of aggregation would be different for the different isomers. Preliminary experiments with [AuCl(4‐Ph 2 PC 6 H 4 CO 2 H)] ( 3 ), which forms a hydrogen‐bonded dimer in the solid state (Figure 1), were unsuccessful since the complex was resistant to dehydrochlorination with mild bases and was decomposed by stronger ones.…”

H-bonded adducts of [2,4,6-{(C10H21O)3C6H2NH}3C3N3] with [LnM{PPh2(C6H4CO2H)}] displaying Columnar Mesophases at Room Temperature

“…The assignments given were confirmed by COSY and 1 H { 31 P} NMR. 19 F NMR spectra of compounds 5 and 6 show two sets (1:2 ratio) of three resonances (2:1:2 ratio) due to the C 6 F 5 groups in the range from −120 to −122 (F ortho ), −157 (F para ), and −160.5 and −161 ppm (F meta ). A singlet at around −79 ppm is observed for the triflate anion of compounds 7 and 8.…”

“…14 1 H, 19 F, and 31 P{ 1 H} NMR chemical shifts are quoted relative to SiMe 4 (external, 1 H), CFCl 3 (external, 19 F), and 85% H 3 PO 4 (external, 31 P). Emission and excitation spectra at 298 and 77 K were measured in the solid state as finely pulverized KBr mixtures and in deoxygenated CH 2 Cl 2 solutions (about 10 −3 M) in quartz tubes with a Perkin-Elmer LS-55 spectrofluorimeter.…”

“…16 In line with our previous works on metallo−organic supramolecular assemblies, the carboxylic functional group of these diphenylphosphinobenzoic acids is suitable to produce H bonds. For instance, 2-diphenylphosphinobenzoic acid is a dimer with typical carboxylic acid bridges, 17 and gold(I), 18,19 and copper(I) 20 derivatives have been reported also as Hbonded dimers. P-containing metallomesogens are uncommon because of the unfavorable tetrahedral geometry imposed by the phosphorus atom.…”