Synthesis, Characterization, and Photophysical Properties of Some Heterodimetallic Bisporphyrins of Ytterbium and Transition Metals – Enhancement and Lifetime Extension of Yb3+ Emission by Transition-Metal Porphyrin Sensitization

✍ Scribed by Feng-Lei Jiang; Wai-Kwok Wong; Xun-Jin Zhu; Gui-Jiang Zhou; Wai-Yeung Wong; Po-Lam Wu; Hoi-Lam Tam; Kok-Wai Cheah; Cheng Ye; Yi Liu

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 211 KB
• Volume: 2007
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200700153

✦ Synopsis

Abstract

A series of d‐f heterodimetallic bisporphyrin complexes (YbZn, YbPd, and YbPt), in which a Yb^III^ porphyrinate moiety is linked to a transition‐metal porphyrinate moiety by a flexible three‐carbon chain, were synthesized. They were fully characterized by high‐resolution mass spectrometry, ^1^H and ^31^P NMR spectroscopy, electronic absorption, andfluorescence methods. Variable‐temperature near‐infrared photoluminescence studies showed that the transition‐metal porphyrinate moiety would enhance the ytterbium(III) emission centered at about 998 nm and extend its emission lifetime. YbPd and YbPt showed large two‐photon absorption cross‐section values because of the interaction between the porphyrin units, which caused a loss of centrosymmetry. Optical limiting investigation demonstrated that [Yb(TPP)(L~OMe~)] and YbPt have comparable performance to C~60~ by virtue of their heavy‐metal effect. Our results indicate that these bisporphyrin dimetallic complexes will find valuable applications in the field of nonlinear optics. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)