Infrared Analysis of Isomeric Dicyanobenzene Mixtures

Abstract

greater the accuracy. The solubility is such, however, that the maximum concentration attainable at room temperature was 40 mg. per 100 ml. of solution.The results obtained with synthetic mixtures containing known amounts of RDX and HMX are shown in Table I. The grand average of the results obtained on six synthetics, each analyzed in triplicate, was 99.94% recovery with a standard deviation of 0.48%. The RDX and HMX used to prepare the synthetic mixtures were purified by recrystallizing small batches two times from acetone. The melting points were in agreement with the published values.Results obtained on plant manufactured samples are shown in Table II. The method has been very useful in controlling the quality of the manufactured products.

Hunting the relatives of benzonitrile: Rotational spectroscopy of dicyanobenzenes

“…Experimental investigations of DCBs have proven quite challenging, however, because of both their low solubility in common solvents and their low volatility (Barraclough et al 1977), the latter of which has prevented gas-phase vibrational investigations so far. While the first laboratory observation the vibrational spectra of DCBs dates back to the late 1950s (Hadden & Hamner 1959), the first vibrational assignments were only proposed in the late 1970s (Barraclough et al 1977;Castro-Pedrozo & King 1978); these spectra have now been investigated from the infrared down to the terahertz domain (Melinger et al 2006;Esenturk et al 2007;Oppenheim et al 2010). It is worth noting that some discussion surrounds the vibrational assignments, even when supported by quantum chemical calculations (Arenas et al 1988a(Arenas et al ,b, 1989Lopez Navarrete et al 1993;Higgins et al 1997;Kumar & Rao 1997;Oppenheim et al 2010).…”