The synthesis of dithiocacodylate complexes of the metals chromium(111), indium(111), manganese(11), cobalt(11), nicke1(11),� zinc(11), and copper(1) is described. The compounds can be prepared either from sodium dithiocacodylate Na[S2As(CH3)2] or by passing hydrogen sulphide through a methanolic solution of the metal cacodylate in the presence of hydrogen chloride. The infrared spectra in the region 4000-40 cm-1 of the new compounds have been recorded and assigned by a comparison with the spectra of several compounds which are closely related. The arsenic-sulphur and metal-sulphur stretching frequencies occur in the region of 450 cm-1 and 260-340 cm-1, respectively.

The Raman spectra of benzene-, p-chlorobenzene-, p-bromobenzene-, p-methoxybenzene-, and o-, m-, and p-toluene sulphonyl chlorides and fluorides and methylbenzene sulphonate are recorded as well as the infra-red absorption bands of liquid benzene sulphonyl chloride and fluoride between 650 and 3100 cm.-l. A frequency c. 375 cm.-1 is characteristic of the S-Cl bond in sulphonyl chlorides and a strong band at c. 1210 cm.-1 is characteristic of the sulphonyl fluoride group. A Raman band at c. 1080 cm.-l in the chlorides and c. 1095 cm.-l in the fluorides appears to be associated with aromatic sulphonyl derivatives. There is such a band at 1094 cm.-1 in the Raman spectrum of methyl benzene sulphonate.

The symmetric SO2 stretching frequency in methane sulphonyl fluoride and a number of aromatic sulphonyl fluorides is reassigned to a frequency of 1210 cm-1 on the basis of new infra-red evidence (vapour and solution spectra of CH3SO2F and the infra-red spectra of a number of aromatic sulphonyl chlorides and the corresponding fluorides). Complete vibrational assignments for benzene sulphonyl chloride, benzene sulphonyl fluoride, and methyl benzene sulphonate are also given. The S-F stretching frequency appears as a strong infra-red band near 780 cm-1 and the aromatic sulphonyl frequency near 1090 cm-1 is identified as being more specifically characteristic of the Car-S bond.

Equations relating the magnetic resonance spectral parameters N and L of the AA'BB' system to the conformational populations of 1,2-disubstituted ethanes of the type XCH2CH2Y are derived for a variety of substituents. These equations are used to obtain conformational information for choline, tryptamine and tyrarnine derivatives in solution.

Site-exchange reactions for PtMe3(gly)(D2O), and isomers of PtMe2Br(gly)(D2O) with D2O coordinated trans to methyl have been studied, and rate constants determined by complete line shape analysis of 1H n.m.r. spectra in the methyl region (gly = H2NCH2CO2-). It is proposed that these reactions involve exchange of the labile water molecule with solvent water, with an associated migration of a donor atom (nitrogen or oxygen). Dissociative and associative (edge displacement) reaction pathways compete. The site-exchange reaction for PtMe3(gly)2- appears to occur by dissociation of a Pt-O bond.