Synthesis, characterization, and photoluminescence studies of gold(I) complexes /
Photoluminescence properties are generally observed from three-coordinate Au(1) complexes. Until now there was no concrete experimental evidence, structural or spectroscopic, to prove that the Ed-coordinate complex is the luminescent species in the solid state or in solution. The synthesis, characte...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1998.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=732843301&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Photoluminescence properties are generally observed from three-coordinate Au(1) complexes. Until now there was no concrete experimental evidence, structural or spectroscopic, to prove that the Ed-coordinate complex is the luminescent species in the solid state or in solution. The synthesis, characterization, and photoluminescents properties of (a-coordinate Au(I) has been investigated in aqueous solution utilizing the trisulfonated triphenylphosphine ligand (TPPTS) as the sodium and cesium salts. Emission and 3lP NMR experiments have provided evidence that demonstrates that the stability of the St-coordinate complex is dependent on the dielectric constant and ionic strength of the solution. The emission spectra of [(AUITPPTSIłB-] are similar in the solid state and in solution, [31P INMlt] solid state and solution spectra also support the fact that the S3-coordinate species is the primary species present in the solid state and in aqueous solution. The singlet-to-triplet absorption has been observed and based on the extremely low extinction coefficient is a forbidden transition. The [(Au('I-IPTS)a)8-] complex has been structurally characterized and the Au(I) center has a planar three- characterized and the Au(I) center has a planar three-properties of the TPPTS ligand, no counter-ion is present in the crystal lattice thus allowing the Au(I) center to be strictly three-coordinate. Photoluminescence quenching experiments have been performed and it has been found that molecules such as Oa and alkyl halides quench the emission of the complex. Methods by which this can occur are discussed. In order to compare nitrogen vs. phosphorous bonding, the [(hmt)AuCl] complex was synthesized and characterized where (hmt) = hexamethylenetetramine. The complex does not exhibit Au...Au interactions like the phosphine derivative (TPAIAUCI. Attempts to synthesize other Au-nitrogen complexes have produced the complexes [(PPha)Au(3,5-Phapz)] and [(TPA)Au(3,5-Phcpz)]. These complexes have been structurally characterized and exhibit Au...Au interactions in the solid state. They also exhibit luminescence in the solid state at 77K. The transition has been assigned as a ligand to metal charge transfer process. |
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| Item Description: | Vita. "Major Subject: Chemistry". |
| Physical Description: | xiii, 131 leaves : b illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references: pages 125-130. |