Synthesis and Biological Activity of New 3-Pyrazolyl-6-hydrazinylpyridazine Derivatives

Russian Journal of General Chemistry - A new series of pyrazolylpyridazine derivatives was obtained on the basis of 3-pyrazol-1-yl-6-hydrazinylpyridazine. Biological screening has identified a...     

Superconductivity of In-doped Sn0.62Pb0.33Ge0.05Te alloys

A study of the Hall and Seebeck coefficients and of resistivity has been carried out on an Sn_0.62Pb_0.33Ge_0.05Te alloy doped by 5 and 10 at. % In. A superconducting transition with the maximum critical temperature T _C～4 K has been discovered in samples with hole concentrations p≥1×10²¹ cm^?3. The dependence of T _C on hole concentration has been established to be of a threshold nature. The onset of superconductivity is accompanied practically simultaneously by a growth of the resistivity and a sharp drop of the Seebeck coefficient. These features in the experimental data indicate the existence of a band of In resonance states within the allowed valence-band spectrum and strong resonance hole scattering to impurity states. The threshold character of the T _C(p) dependence is connected with the holes filling the resonance states. A positive correlation between the resonance scattering intensity and the critical temperature is observed.     

Synthesis of Potential Biologically Active Compounds Based on Aryloxy- and Arylaminopropanehydrazides

Russian Journal of General Chemistry - New derivatives of a number of aryloxy and arylaminopropanehydrazides were synthesized. Their heterocyclization under the action of carbon disulfide and...