Group IIIA ligands

PLATINUM COMPLEXES OF GROUP IIIA LIGANDS 52.3.1 Diphenylboron Complexes... 

This chapter is organised into Sections for the Groups IIIA-VIIA each of which is ordered in topics concerning syntheses and reactivities of classes of complexes with similar ligand systems. 

Metals of Valency Three and Higher.— There have been several reports of the measurement by n.m.r. of the kinetic characteristics of complexes of Group IIIA tervalent metal ions. Delpuech et al. have used the spectra associated with the A1 and nuclei to identify the species present in solutions of the metal and a number of phosphorus-containing ligands, and to measure their exchange characteristics. It appears that the major solvates of AP+ in trimethyl (TMPA) and triethyl phosphates (TEPA), dimethyl methyl- (DMMP) and diethyl ethyl-phosphonates (DEEP), and dimethyl hydrogen phosphite (DMHP) are octahedral. In each case the rate law for the exchange process,... 

Ligand for metals of Groups IIIA, IVA, IIIB, VB, VIB, and VIII, as well as rare earth metals. Used as soln. in 1,2-dichloroethane for extraction separation of Ti. Hygroscopic needles. Sol. 1,2-dichloroethane. Mp 68-69°. Bp 300°, Bp2 134-135°. pK 8.75 (MeN02). 

Fig. 7. Stereo view of human serum albumin illustrating the overall topology and secondary structure. The positions of the 17 disulfides and the side chain of Cys-34 are shown in red. Structurally, HSA consists of 28 helices, which range in size from 5 to 31 amino acids in length and which can be grouped into 10 principal helices within each domain. The positions of the two major binding sites of HSA, located within subdomains IIA and IIIA, are illustrated with the ligand 2,3,5-triiodobenzoic acid, shown in white. Figure drawn using program RIBBONS (Carson, 1987).

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