Search

Research has been conducted on the nitrosyl containing products obtained from aqueous [Ru(bpy)-(NO (sub)2) (sub)4] (super)2- solutions at different pH values. The synthesis, characterization and single-crystal X-ray structure of these products are described.

A three-channel cross-reactive sensor array based on vapoluminescent platinum(II) double salt materials has been characterized. Two arrays were studied, one consisting of [Pt[(CN-cyclododecyl).sub.4]][Pt[(CN).sub.4]] (1), [(phen)Pt[(CN-cyclohexyl).sub.2]][Pt[(CN).sub.4]] (2), and [Pt[(CN-n-tetradecyl).sub.4]][Pt[(CN).sub.4]] (3) materials, where phen = 1,10-phenanthroline, and a second array that has compound 3 replaced by the mixed double salt material [[(phen)Pt[(CN-cyclododecyl)Cl)].sub.2][[(phen)Pt[(CN- cyclododecyl).sub.2]].sub.2][[Pt[(CN).sub.4]].sub.3] (4). Compounds 2, 3 and 4 are characterized here for the first time. Inclusion of solvent vapors into these materials often leads to dramatic shifts in their solid-state absorption and luminescence spectra. In these studies the arrays were exposed to a set of 10 test solvent vapors to determine the ability of each cross-reactive array to give reproducible vapoluminescent spectra characteristic of each solvent vapor. It was discovered that temperature programming between solvent vapor exposures greatly improved the reproducibility of the luminescence spectra obtained. A statistical analysis of three-dimensional resolution factors between pairs of solvent clusters in principal component space supported this assertion. The success of the temperature programming protocol was limited by the thermal stability and the sensitivity to low background water vapor levels of some platinum(II) double salt materials. The ability of the cross-reactive sensor array to differentiate between two different solvent vapors over a large concentration range was also investigated. Acetone and methanol were found to occupy two distinct regions of the three-dimensional principal component space. Detection limits for acetone and methanol were estimated from the principal component analysis as 75 and 6 g/[m.sup.3], respectively.

Research has been conducted on the K (sub)2 [Ru(bpy)(NO (sub)2) (sub)4]. The synthesis of this compound has been carried out via the thermal displacement of benzene by the nitrite ion in the methanol solution and the results are reported.

The electronic and molecular structures for the ground and excited electronic states of aromatic terthiophene (3T), the quinodimethane 3',4'-dibutyl-5,5'-bis(dicyanomethylene)-5,5'-dihydro-2,2':5',2'-terthiophene (3Q), and isologues with the middle ring S-oxidized (3TO2, 3QO2) are analyzed. These have represented the extremes of electron rich and deficient ground states, often displaying complementary properties and the florescence emission is quenched in the sulfonated terthiophene and the contrary effect again would be expected upon sulfonation of a quinoid emitter.

A unique cluster containing two short Pt->Ag dative bonds was synthesized and characterized crystallographically. Two monocationic orthometalated Pt(super II) complexes containing 2-phenylpyridine and the tridentate ligand 9S3 (1,4,7-trithiacyclononane) exhibit axial sulfur interactions with Pt as well as short dative bonds.

The synthesis and characterization of quinodimethane-substituted oligomers is reported. The electrochemistry of these materials indicates their suitability for both p and n biasing in field effect transistors (FETs).

Research describing thee process of design and the testing of an electronic nose based on an array of salts of vapoluminescent characteristics is presented. Particular attention is given to the construction of the array elements and to the synthesis of salts.