Compound Hg Research Articles

Information integration and compounding of discriminative stimuli in pigeons

Keypecks were reinforced with food in three pigeons according to a multiple schedule with variable interval schedules of reinforcement associated with the components. If the key was green (G) or white with three horizontal black lines (H), variable interval 30 sec was in effect. A red key (R) or three black vertical lines on a white surround (V) indicated that variable interval 60 sec was in effect. Following this training, a single test session was conducted in which the reinforcer was not available and in which the single stimuli and the compounds HG, HR, VG, and VR were presented. Response rates to the compounds were generally less than to the elements alone. This unexpected result was apparently due to degrading of the stimuli during superimposition. However, the compound rates aligned well with a linear model that assumes no interaction between orientation and color stimuli. This initial agreement with Anderson’s information integration approach suggests further application of the model to stimulus compounding in infrahuman animals.

Hg 2M 2F 6S et Hg 2M 2F 6O: Deux nouvelles familles de pyrochlores contenant du mercure et des métaux M de transition divalents

New pyrochlore compounds Hg 2 M 2F 6S ( M = Zn, Cu, Ni, Co, Mn, Mg) and Hg 2 M 2F 6O ( M = Zn, Cu, Ni, Co, Mg) have been prepared and characterized. They all have a cubic structure ( Fd3 m) except Hg 2Cu 2F 6O, which shows a tetragonal distortion. Refinement of crystal structures of five compounds from powder diffractometer intensities leads to a positional parameter x(48 f) lying from 0.315 to 0.319. The evolution of interatomic distances and independance of two networks (Hg 2 X′) 2+ and ( M 2F 6) 2− are examined.

Komplexchemie polyfunktioneller Liganden, XXXIV.

Octacarbonyldicobalt reacts with the ditertiary phosphine and arsine (C6H5)2-ECH2CH2E(C6H5)2 (E = P, As) in a direct route to give primarily the non CO-bridged, but ligand-bridged complexes Co2(CO)6(C6H5)2ECH2CH2E(C6H5)2. From Co2(CO)6-(C6H5)2PCH2CH2P(C6H5)2 secondarily a CO-bridged isomer has been also isolated. The non-CO-bridged form of Co2(CO)6(C6H5)2PCH2CH2P(C6H5)2 gives insertion reactions with Hg, SnCl2 and CsGeCl3 yielding the probably oligo- or polymeric compounds Hg[Co(CO)3]2(C6H5)2PCH2CH2P(C6H5)2 and Cl2M[Co(CO)3]2(C6H5)2PCH2CH2P(C6H5)2 (M = Sn, Ge). The characteristic IR absorptions of all compounds and some Raman spectra are reported.

Organothiometallic compounds. Part I. Infrared and Raman spectra of some di(alkylthio)mercury(II) compounds

I.r. and Raman spectra in the range 800–100 cm–1 of a series of di(alkylthio)mercury(II) compounds Hg(SR)2(I; R = Me, Et, Prn, Pri, Bun, Bui, or But) have been recorded and discussed. The main fundamentals have been identified in the following ranges: ν(C–S), 575–725, ν(S–Hg–S), 200–338 in the solid and 209–371 cm–1 in solution. The spectral features agree with a linear S–Hg–S structure and with the characteristic two-co-ordination of mercury. Spectra of the solid (I; R = But) differ from those of the other compounds and are interpreted on the basis of a polymeric centrosymmetric structure. The spectral pattern of some of the compounds (I) suggest the existence in solution of more than one rotational isomer. The frequency ν(S–Hg–S) in the solid, related to the strength of the mercury–sulphur bond, decreases with increasing electron-releasing ability of the alkylthio-groups. However, a strictly linear correlation between ν(S–Hg–S) and the basicity of the alkyl radicals does not exist.

Organomercury compounds. XVIII. Thermal decomposition reactions of mercuric arenesulphonate pyridinates

The mercuric arenesulphonate pyridinates, Hg(O3SR)2,(py)2 (R = C6X5, p- HC6X4, o-HC6X4, or m-HC6Cl4; X = Cl or F) and Hg(O3S-m-HC6F4)2,(py)3, have been prepared by treatment of the appropriate mercuric arenesulphonate dihydrates with pyridine. Thermal decomposition of the compounds Hg(O3SR)2,(py)2 (R = C6X5, p-HC6X4, or m-HC6Cl4) and Hg(O3S-m-HC6F4)2,(py)3 at c. 120-240� under vacuum gave the corresponding diarylmercurials (yields: 45-90%) and the complex (py),SO3 in all cases, together with (- m-HgC6F4SO3-)n, and low yields of polyfluorobenzenes and/or polyfluorobenzenesulphonic acids. Similar decomposition of the compounds Hg(O3S-o-HC6X4)2,(py)2 gave (-o-HgC6X4SO3-)n, (py),SO3, o- HC6X4SO3H, and o-H2C6X4, and there was some evidence for formation of a trace of o-(o-HC6Cl4- SO3Hg)C6Cl4SO3HgO3S-o-HC6Cl4. The derivatives (- HgC6X4SO3-)n, were identified by established degradation procedures.

An order-disorder transformation in Hg 3In 2Te 6

An order-disorder transformation has been observed in the semiconducting compound Hg 3In 2Te 6. Extinction of superlattice X-ray reflections and a kink in the temperature dependence of electrical resistivity show that the change from an ordered to a disordered structure is complete at 595 ± 5°K.

Vibrational and electronic spectra of transition metal carbonyl complexes IV. Infrared spectra of some cobalt complexes

The infrared spectra of the compounds Hg[Co(CO) 4] 2, Hg[Co(CO) 3PR 3] 2, and Co 2(CO) 6(PR 3) 2, where R = OPh, Ph, Et, and Bu, have been measured in the 2000 cm −1 and 4000 cm −1 regions. Assignments in the fundamental CO stretching region have been made according to D 3 d selection rules and are consistent with binary combination data.

Polarographic Investigation of Mercaptobenzothiazole

The cathodic and anodic behavior of mercaptobenzothiazole at the dropping mercury electrode has been investigated. It has been found that the anodic electrode reaction does not correspond to an oxidation to the disulfide, but to the formation of the mercurous compound Hg (mercap.). Only one electron is involved in the process and the diffusion coefficient has been found to be .An equation has been derived to interpret the experimental results: from the dependence of the half‐wave potential on the pH, it has been possible to calculate the dissociation constant of mercaptobenzothiazole. This value is in agreement with the one obtained potentiometrically.The catalytic nature of the cathodic waves has been demonstrated. The height of this wave, i.e., the current due to the catalytic evolution of hydrogen, is proportional to the hydrogen ion concentration of the buffer, and it depends on the concentration of the catalyst through a relationship given by the Langmuir isotherm.