Broadband Reflection Spectra of Saccharides in the THz and IR Ranges

Optics and Spectroscopy - The reflection spectra of pure single-phase pressed samples of saccharides are measured by the methods of coherent submillimeter, pulsed terahertz, and broadband...     

New Gold(I) Complexes with 1,5-Diaza-3,7-Diphosphacyclooctanes: Synthesis and Structures

Russian Journal of Coordination Chemistry - New bi- and trinuclear gold(I) complexes are synthesized by the reactions of gold(I) chloride or tetrahydrothiophenegold(I) chloride with...     

Mass-Spectrometry of Phosporic and Arsenic Heterocycles

Abstract

Some O,P,B (I)-, N,P,B (II), - As,N(III) - heterocycles and 1,3,2-dioxaborinanes(IV) have been studied by a high resolution mass-spectrometry of electron impact.     

Synthesis of New 1,3,5-Azadiphosphorinanes Based on Aliphatic Amines

Russian Journal of General Chemistry - New 1-aza-3,5-diphosphorinanes have been synthesized as a mixture of RR/SS- and RS-isomers via the reaction of bis(phenylphosphanyl)methane, paraformaldehyde,...     

Pyridyl Containing 1,5‐Diaza‐3,7‐diphosphacyclooctanes as Bridging Ligands for Dinuclear Copper(I) Complexes

1,5‐bis(R)‐3,7‐bis[2‐(pyridine‐2′‐yl)ethyl)‐1,5‐diaza‐3,7‐diphosphacyclooctanes 1 and 2 and their copper(I) complexes 3 and 4 were developed. The butterfly‐shaped copper‐iodide core and unusual P,N‐chelate and P,P‐bridged coordination mode of the heterocyclic ligand in the dinuclear complexes 3 and 4 were revealed. Complexes 3 and 4 display emission in green range of spectra, with lifetimes in a microsecond domain and quantum yields of luminescence in solid‐state up to 38 %. Thermochromic effects found for the phosphorescence of 4 in solutions are ascribed to rigidochromism.     

On the existence of extremal functions for a weighted Sobolev embedding with critical exponent

We investigate the existence of ground state solutions to the Dirichlet problem in , u = 0 on , where , and is a domain in . In particular we prove that a non negative ground state solution exists when the domain is a cone, including the case . Moroever, we study the case of arbitrary domains, showing how the geometry of the domain near the origin and at infinity affects the existence or non existence of ground state solutions. Received April 16, 1998 / Accepted June 24, 1998