Application of transition metal complex formation in gas chromatography, part I

Synthesis and properties of cyanosilicone stationary phases for capillary complexation gas chromatography

“…The modifications performed have enabled us to prepare columns of higher stability which are less sensitive to a continuous loss of the complex. (This latter is a drawback of columns with a metal complex dissolved in liquid stationary phases [22,23]). The results presented here and our previous experiments [2][3][4][5][6][7][8][9][10][11][12] show that the efficiency and high selectivity of a CN 9 CuC12 column should give a better separation of compounds of electron-donor character than columns with free cyano groups.…”

Sample Preparation for Chromatographic Analysis

“…Perhaps the most widely known example of complexation chromatography is the use of silver ions to complex organic compounds containing 7r-electrons in various kinds of double and triple bonds, or containing heteroatoms, such as N, 0, and S with lone pairs of electrons [811,812]. Such coordinative interactions are very sensitive to subtle differences in the composition or stereochemistry of the donor ligand, owing to the sensitivity of the chemical bond towards electronic, steric and strain effects.…”

Selective retention of oxygen using chromatographic columns containing metal chelate polymers

“…Investigations of organic pollutants in wastewaters and natural waters in the U.S. also showed the presence of this class of chemicals. 4-(l,1,3,3-Tetramethylbutyl)phenol polyethoxylates (OPEOs) and their chlorinated derivatives have been identified as contaminants in the Delaware River (7), and alkylphenoxy mono-and diethoxycarboxylic acids have been detected in treated sewage effluents (8), together with corresponding bromine-containing derivatives formed by chlorination of the sewage effluents. These acids are also considered to be refractory metabolites of APEOs on the basis of laboratory simulation studies (5).…”

“…One possible way to achieve such a separation is to use a metal chelate complex that is incorporated into the stationary phase of the chromatographic column and selectively interacts with oxygen. The use of metal ions and metal complexes in chromatographic systems is well-known, and several reviews describe examples of the use of such systems (5)(6)(7)(8). The reversible interaction of certain compounds or classes of compounds with the metal ion to form metal complexes serves as the mechanism to selectively increase the retention of these ligands.…”