The interactions between ligands and transition metals have been an essential subject in inorganic chemistry. Other than the commonly known L-type (two-electron donors) and X-type ligands (one-electron donors), Z-type ligands (two-electron acceptors) have begun to surface in the past decade. Capable of drawing a pair of d-electrons away from a metal, Z-ligands affect the electronic structures of transition metals leading to fascinating properties as well as reactivity. In particular, recent advance in Z-ligand chemistry have resulted in the discovery of transition metal borane complexes featuring metal → boron interactions. Owing to the presence of a metal → boron interaction which stabilizes the low valent state, these complexes have been shown to activate small molecules such as H2, CO2, and CHCl3. Further, the concept of Z-ligand has been extended to s- and d-block Lewis acids. In spite of these achievements, Z-ligands that contain Group 14-16 elements as Lewis acids remain scarce and relatively unexplored. For this reason, we have launched a series of investigations targeting complexes with transition metal → Group 14-16 interactions. These investigations have allowed us to synthesize a series of novel complexes with palladium, platinum, or gold as metallobasic late transition metals and tin, antimony, bismuth, and tellurium as Lewis acids. The transition metal → Lewis acid interactions of these complexes, which are supported by o-phosphinophenylene, 1,8-naphthalenediyl or 8-quinolinyl buttresses, have been established experimentally and theoretically. Further, the reactivity of these complexes toward anions and oxidants has also been explored. These experiments have led to the discovery of tellurium-platinum complexes that sustain reversible two-electron redox processes including the photo-reductive elimination of chlorine. Other noteworthy outcomes of this research include the isolation of the first telluroxanyl-metal complex as well as the discovery of complexes with HgII → SbV interactions.

Thesis (Ph. D.)--Michigan State University. Dept. of Chemistry, 2007. / Title from PDF t.p. (viewed on Apr. 16, 2009) Includes bibliographical references. Also issued in print.

Thesis (Ph. D.)--Brown University, 1926. / Part 1 reprinted from Journal of the American chemical society, v.47, 1925. Part 2 of thesis has title: Liquid mixtures of tellurium and sodium telluride. I. Specific resistance as a function of composition and temperature.

Thesis (M.S. in material science and engineering)--Washington State University, May 2010. / Title from PDF title page (viewed on July 14, 2010). "School of Mechanical and Material Engineering." Includes bibliographical references (p. 90-92).

Orientador: Keizo Yukimitu / Banca: José Brás Barreto Oliveira / Banca: Noelio Oliveira Dantas / Resumo: Neste trabalho foi estudado o sistema vítreo (100-x)% (80% TeO2-20% WO3)-(x)% Yb2O3, onde x = 0; 0,1; 0,2; 0,3; 0,4 e 0,5%. As técnicas de difração de raios-X, espectroscopia no infravermelho, espectroscopia Raman e espectroscopia no UV-Vis foram usadas para caracterizar os efeitos da dopagem sobre as propriedades estruturais e ópticas dos vidros estudados. Usando os dados de espectroscopia na região espectral ultravioleta-visível foi possível observar que não houve mudança das freqüências de corte para cada composição e ainda calcular a energia de "gap" e a energia de cauda de Urbach. Usando os dados de fotoluminescência observam-se picos que indicam o desdobramento dos níveis de energia dos estados 2F7/2 e 2F5/2 dos íons de Yb3+. Para os comprimentos de onda de excitação de 514,5 a 488,0 nm, crescem as taxas de absorção do sistema vítreo TW, transferência de carga para o estado 2F5/2 do Yb3+ e da transição radiativa 2F5/2 2F7/2, aumentando, desta forma, a intensidade da fotoluminescência. Já para os comprimentos de onda de excitação 457,9 e 476,5 nm as taxas de absorção do sistema vítreo TW, a transferência de carga para o estado 2F5/2 do Yb3+ e a transição radiativa 2F5/2 2F7/2 são as mesmas e, consequentemente, a intensidade da fotoluminescência é constante. / Abstract: This work presents the study on the glassy system (100-x)% (80% 20% TeO2-WO3) - (x)% Yb2O3 where x = 0, 0.1, 0.2, 0.3, 0.4 and 0 5%. The techniques of X-ray diffraction, infrared spectroscopy, Raman spectroscopy and UV-Vis were used to characterize the effects of Yb doping on the structural and optical properties of the glasses. Using data from spectroscopy ultraviolet-visible spectral region was observed that there was no change of cutting frequencies for each compound and were calculate the energy gap and Urbach tail energy. Using the data of photoluminescence peak is observed indicating the splitting of energy levels of states 2F7/2 and 2F5/2 of Yb3+ ions. The rate of electron transition probability is influenced by temperature. To the excitation wavelength of 514.5 to 488.0 nm, growing rates of absorption of the glass system TW, charge transfer to the state 2F5/2 of Yb3+ and the radiative transition 2F5/2 2F7/2, increasing thus the photoluminescence intensity. As for the excitation wavelength of 476.5 and 457.9 nm absorption rates of the TW glass system, the charge transfer state to the 2F5/2 of Yb3+ and the radiative transition 2F5/2 2F7/2 are the same and, hence the photoluminescence intensity is constant. / Mestre

Made available in DSpace on 2014-10-09T12:29:26Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:01:16Z (GMT). No. of bitstreams: 1 00406.pdf: 1086747 bytes, checksum: c5381220f76c0f0fbd40893ba1e27e0d (MD5) / Dissertacao (Mestrado) / IEA/D / Escola Politecnica, Universidade de Sao Paulo - POLI/USP

Made available in DSpace on 2014-10-09T12:26:04Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:06:42Z (GMT). No. of bitstreams: 1 01327.pdf: 1974517 bytes, checksum: a3167e3356fb407015ce2805648b3b94 (MD5) / Tese (Doutoramento) / IEA/T / Instituto de Fisica, Universidade de Campinas - IF/UNICAMP

Made available in DSpace on 2014-10-09T12:29:26Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:01:16Z (GMT). No. of bitstreams: 1 00406.pdf: 1086747 bytes, checksum: c5381220f76c0f0fbd40893ba1e27e0d (MD5) / Dissertacao (Mestrado) / IEA/D / Escola Politecnica, Universidade de Sao Paulo - POLI/USP

Made available in DSpace on 2014-10-09T12:26:04Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:06:42Z (GMT). No. of bitstreams: 1 01327.pdf: 1974517 bytes, checksum: a3167e3356fb407015ce2805648b3b94 (MD5) / Tese (Doutoramento) / IEA/T / Instituto de Fisica, Universidade de Campinas - IF/UNICAMP

No description available.