David M. Watkins

The electrical conduction and optical properties of the new 1D conductor Zn0.81[Pt(C2O4)2] · 6H2O

Abstract Variable temperature (305−50K) 4-probe dc conduction and optical reflectivity (4,200 − 25, 000 cm−1 studies on Zn0.81[Pt(C2O4)2] · 6H2O are described. The optical properties are very similar to those of K2 [Pt(CN)4] Br0.3 · 3H2O except that ωp occurs at a lower frequency. The conduction properties are compared with those of the isostructural salts Co0.83 [Pt(C2O4)2] · 6H2O and Mg0.82 [Pt(C2O4)2] · 6H2O.

Photolysis of vinclozolin

Abstract Following photolysis of vinclozolin in methanol five products were detected and identified: 3,5-dichlorophenylisocyanate, 3,5-dichloroaniline, methyl 3,5-dichlorophenylcarbamate, 3-(3-chlorophenyl)-5-methyl-5-vinyl-oxazolidine-2,4-dione and methyl (3,5-dichlorophenyl) (2-hydroxy-2-methyl-1-oxo-buten-3-yl) carbamate. The major component identified from photolysis in benzene solution, 3-(3-chlorobiphenyl)-5-methyl-5-vinyl-oxazolidine-2,4-dione, was produced by replacement of one chlorine atom by a solvent molecule.

Linear Chain Bis ( oxalato ) platinate Salts

The great current interest in the chemical and physical properties of bis(oxalato)platinate salts can be directly traced to the characterization by Krogmann less than 20 years ago of several of these salts as partially oxidized materials with seemingly metallic-like properties in one dimension.1–4

Studies on partially oxidised one-dimensional bis(oxalato)platinate salts containing divalent cations

Abstract The preparation and electrical conduction properties of the isostructural one-dimensional conductors Ni 0.84 [Pt(C 2 O 4 ) 2 ]·6H 2 O(Ni-OP) and Mn 0.81 [Pt(C 2 O 4 ) 2 ]·6H 2 O(Mn-OP) are described. Ni-OP exhibits a similar tem dependence of conductivity to the isostructural compounds Co 0.83 [Pt(C 2 O 4 ) 2 ]·6H 2 O(Co-OP) and Zn 0.81 [Pt(C 2 O 4 ) 2 ]·6H 2 O whereas the behaviour of Mn-OP is rather like that of K 2 [Pt(CN) 4 ]Br 0.3 ·3H 2 O. These differences are discussed in terms of the variation from compound to compound of the critical temperature for the formation of the “non-Peierls” superstructure ( T c ) and the temperature at which the CDW/PD on adjacent conducting chains undergo three-dimensional ordering ( T 3 D ). The variation of thermopower with temperature for Co-OP and Mg 0.82 [Pt(C 2 O 4 ) 2 ]·6H 2 O is reported and related to the conduction properties and phase changes which have been observed for these compounds. For the isostructural series M 0.8 [Pt(C 2 O 4 ) 2 ]·6H 2 O (M = Mg, Mn, Co, Ni or Zn) the variation of ( T 3 D ) from compound to compound is related to differences in the polarizing power of the cations.

The effect of ultra-violet light on 1-naphthalene-acetic acid

Abstract Irradiation of an aqueous solution of 1-naphthalene acetic acid (NAA) with light of wavelength 253·7 nm gave 1-naphthaldehyde, 1-naphthylcarbinol, 1-naphthoic acid, 1-methylnaphthalene and naphthalene. After 3 days only 9% NAA remained. In ethanolic solution phthalic acid was also produced in addition to ethyl 1-naphthoate and ethyl 1-naphthyl acetate.

Photolysis of diclobutrazol in methanol

Abstract The fungicide diclobutrazol (2RS,3RS)-1-(2,4-dichlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-ol was irradiated by ultra-violet light in methanol solution using (1) borosilicate glass apparatus and (2) quartz apparatus. The major differences observed were that photodegradation occurred more rapidly in (2) than (1) and more breakdown products were found in the former. Using g.c.-m.s. ten compounds were detected in (1) of which five were identified. In (2) twelve of the eighteen compounds observed were identified and the major component was 1-(4-chlorophenyl)-4,4-dimethyl-2-(1H-1,2,4-triazol-1-yl)pentan-3-one. The compounds reported were formed by oxidation, loss of chlorine or by cyclisation. This previously unreported cyclisation gave the s-triazolo-(5,1a)isoquinoline ring system.

X-Ray Diffuse Scattering from Several Platinum-Atom Chain 1-D Conductors and a Detailed Investigation of the Solid-State Properties of Rb3(H3O)0·2 [Pt(CN)4] (O3SO·H·OSO3)0·5·0.8H2O

X-ray diffuse scattering studies at room temperature for seven one-dimensional metallic complexes are reported. The crystal structure and the temperature dependence of both the electrical conductivity and X-ray diffuse scattering for Rb3(H3O)02 [Pt(CN)4] (O3SOHOSO3)050.8H2O are reported and related to the development of a non-Peierls superstructure below room temperature. The Rb complex is unique in that it contains a polyatomic (> 2) trianion and a ratio of three alkali metal ions per Pt atoms instead of the usual two.

Observation of Four Crystalline Phases of the One Dimensional Conductor Zn0.81 [Pt(C2O4)2] . 6D2O by Neutron Diffraction

Abstract Four different crystalline phases of Zn0.81[Pt(C2O4)2].6D2O have been observed and partially characterized by single crystal neutron diffraction measurements. A crystal in the previously reported orthorphombic α-form was pulled along its c-axis at room temperature and was found to transform to a monoclinic β-form. Two new coexisting phases, monoclinic γ-Zn-OP and orthorhombic δ-Zn-OP were found when the sample was cooled to 200 K. Further crystallographic work is necessary in order to establish the detailed nature of the new phases.

Studies on the mixed valence complexes Cs[PtBr3(NO2)(NH3)] and Cs[PtI3(NO2)(NH3)]

Abstract The complexes Cs[PtX3(NO2)(NH3)] (where X = Br or I) have been shown by photoelectron spectroscopy, optical and X-ray studies to be Class II halogen-bridged mixed valence compounds. They behave as semiconductors between 0 and 60°C and their electrical conduction properties are compared with those of other mixed valence complexes of platinum.

Surface lipids of Sphaerotheca fuliginea spores

Abstract The major components (50%) of the surface lipid extract of fungal spores (5.6% of dry spore wt) of Sphaerotheca fuliginea are esters of primary alcohols and fatty acids. Esters (15%) of primary alcohols and a Δ 2 t acid are present. The major acid moieties of the alkyl esters are C 22 and C 24 and of the Δ 2 t alkyl ester is Δ 2 t C 22 ; for both classes eicosanol is the major primary alcohol. The major ester of each class was concluded to be eicosanyl docosanoate and eicosanyl trans -2-docosenoate. Minor components are saturated and Δ 2 t methyl and diol diesters and free fatty acids. The major acid moieties of the diol diesters are C 22 and C 24 and the major diol is 1,12-dodecanediol.