
%0 Journal Article
%A Gallagher, MJ 
%A Graddon, DP 
%A Sheikh, AR 
%T Thermodynamics of metal-ligand bond formation. XXIV. Reaction of mercury(II) halides with tertiary arsines and phosphine and arsine sulphides
%J Australian Journal of Chemistry
%D 1976/11/01
%V 29
%N 11
%P 2409-2413
%K 
%R https://doi.org/10.1071/CH9762409
%U https://www.publish.csiro.au/paper/CH9762409 
%X Thermodynamic data have been obtained by calorimetric titration for the formation of 1 : 1 adducts of mercury(11) halides with tertiary arsines in benzene solution. In contrast to phosphines, only one molecule of arsine adds to HgX2 in dilute solution. Enthalpies of adduct formation, in the range - &#916;Hº = 50-80 kJ mol-1, are not much changed by replacement of phenyl by methyl, but adduct stabilities increase in the order     Ph3As < Ph2AsMe < PhAsMe2 < AsMe3  HgI2AsMe3 is dimeric in solution. The diarsines Ph2As(CH2),AsPh2 are unidentate, but Ph2P- (CH2),AsPh2 is bidentate. Data are also reported for addition to HgX2 of Ph3PS,Ph2PSCH2PSPh2 and corresponding arsine sulphides; the disulphides are bidentate. Factors affecting chelation in these compounds are discussed. 
