orpiment, getchellite and stibnite from zarshuran deposit, nw iran, exhibit extensive as-sb substitution. there are four known minerals along as2s3-sb2s3 join, i.e. orpiment (as2s3), wakabayashilite [(as,sb)20s30], getchellite (assbs3) and stibnite (sb2s3). extensive mineralogical studies by scanning electron microscope (sem) and electron probe micro-analyzer (epma) indicate that getchellite fr...

In this study, the carbyne complex, OsCl3(=CCH2CMe3)(PH3)2, structural, themochemical andelectronic properties were studied in solution and gas phases. For this investigation, the chosensolvents were five solvents (methanol, acetone, ethanol, DMSO, nitromethane) with variouspolarities. The influence of solvent polarity on the thermodynamic, structural, solvation energyparameters and frontier or...

The intermolecular forces between water molecules are of great importance in many areas of chemistry including solvation, solution chemistry, and biochemistry. As a result of this (H2O)n systems have received a great significant of attention, both experimental and theoretical. All calculation of this study are carried out by Gaussian 98 soft ware. Geometry optimization for each cluster were be ...

Solution equilibria of the cytosineand guanine-rich sequences near the promoter region of the n-myc gene which contain stable hairpins within lateral loops Sanae Benabou, Rubén Ferreira, Anna Aviñó, Carlos González, Ramon Eritja, Joaquim Jaumot, Raimundo Gargallo 1. Solution Equilibria and Chemometrics group (Associate Unit UB-CSIC), Department of Analytical Chemistry, University of Barcelona, ...

Chirality of objects is a problem with important applications in biology, pharmacology, medical cosmetology, organic chemistry, inorganic chemistry, supramolecular chemistry, biochemistry, and other branches of science. In this paper we provide a solution for quantification problem of chirality for three-dimensional objects.