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Title: Synthesis and nonlinear optical absorption of novel porphyrin - Osmium-cluster complexes
Authors: Yang, G.Y.
Ang, S.G. 
Chng, L.L.
Lee, Y.W.
Lau, E.W.-P.
Lai, K.S.
Ang, H.G. 
Keywords: Azido ligands
Cluster compounds
Nonlinear optics
Issue Date: 17-Feb-2003
Citation: Yang, G.Y., Ang, S.G., Chng, L.L., Lee, Y.W., Lau, E.W.-P., Lai, K.S., Ang, H.G. (2003-02-17). Synthesis and nonlinear optical absorption of novel porphyrin - Osmium-cluster complexes. Chemistry - A European Journal 9 (4) : 900-904. ScholarBank@NUS Repository.
Abstract: Reaction of azido(tetra-p-tolylporphyrinato)indium(III) [TTPInN3] and [Os3(μ-H)2(CO)10] in toluene at 80°C overnight gave two major products, complexes 1 and 2. Complex 1 had an axial bridge of "NH", while 2 had an axial bridge of "N" between the porphyrin and osmium cluster moieties. Complex 1 could be converted to 2 when refluxed in toluene. These two novel porphyrin-osmium clusters are the first axially linked porphyrin-metal cluster complexes. UV/Vis spectroscopy revealed the significant ground state electronic perturbation in the capped complex 2, demonstrating that the remarkable electronic interaction of the moieties within the molecule was achieved by this special structural arrangement. In addition, the electrochemistry of 1 and 2 were investigated and their oxidation current voltage curves are similar to those of indium(III)-porphyrins with a metal-metal σ bond such as [TPPInRe(CO)5] (TPP = tetraphenylporphyrin). The two new molecules also exhibit large nonlinear optical absorption at 532 nm with a ns pulse laser and are potential optical limiting materials for sensor protection in the visible region.
Source Title: Chemistry - A European Journal
ISSN: 09476539
DOI: 10.1002/chem.200390111
Appears in Collections:Staff Publications

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