Polymeric assemblies consisting of metal ions coordinated to polycyanide ligands are of interest for their conducting and magnetic properties.1-5 Unusual behavior results from dπ-pπ interactions between open-shell metal ions and organic radicals as illustrated by the family of 3-D metals Cu(R,R′-DCNQI)2 (DCNQI ) N, N′-dicyanoquinone diimine).5 The presence of π-stacked columns of DCNQI radicals...

Compared to the streamwise instability, cross-flow instability in high-enthalpy flows has received relatively less attention, but latter is of vital importance flow transition for practical configurations. This work aims investigate primary and secondary instabilities hypersonic boundary layers, considering thermochemical non-equilibrium (TCNE) effects. The numerical tools adopted include a hig...

A symposium entitled “Molecular Routes to Materials” was held in New York City at the 4th Chemical Congress of the North American Continent in August, 1991. The talks focused on synthetic and mechanistic studies of the formation of metals, borides, nitrides, carbides, oxides, and compound semiconductors from molecular precursors. Dr. Joel Miller (DuPont) outlined recent success in obtaining mag...

Two simple, rapid and sensitive spectrophotometric methods for the determination of three fluoroquinolones, namely levofloxacin, norfloxacin and ciprofloxacin have been performed either in pure form or in their tablets. In the first method, levofloxacin and norfloxacin are directly treated with bromocresol green (BCG) in dichloromethane while ciprofloxacin is allowed to react with the same dye ...

Structural and spectral characteristics of the electrogenerated tetracyanoethylene dianion (TCNE2-) were experimentally and theoretically examined. Spectroelectrochemistry of TCNE gives the spectra of TCNE2- in CH3CN at 220 nm, and in CH2Cl2 at 300 nm. These spectral characteristics are well explained by CIS/6-31G(d) and semiempirical CNDO/S-CI calculations. The bands in CH3CN and in CH2Cl2 are...

The reaction of tetraarylbutatrienes (tetraaryl[3]cumulenes) with tetracyanoethene (TCNE), a strong electron-accepting molecule, at room temperature yielded novel four-membered ring compounds (head-to-tail unsymmetrically substituted diarylallene dimers) by [2 + 2] cycloaddition of the central C=C bond of the butatrienes. This reaction proceeded through a head-to-head symmetrically substituted ...