Multiple bismuth(III)-thioether secondary interactions integrate metalloporphyrin ligands into functional networks.
Kunhao Li, Guo Huang, Zhengtao Xu, Mingliang Zhang, Matthias Zeller, Allen D Hunter, Stephen Sin-Yin Chui, Chi-Ming Che, Wai-Yeung Wong
Index: Inorg. Chem. 46(12) , 4844-9, (2007)
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Abstract
We introduce the 1,2,3-tris(organylthiophenyl) group as a symmetrical, multidentate chelation link for building coordination networks. For this, zinc(II) 5,10,15,20-tetrakis[3',4',5'-tris(methylthio)phenyl]porphyrin was synthesized and integrated into a two-dimensional network via coordination with BiBr3. The coordination link exhibits an unusually complex bonding pattern, involving six S atoms from two neighboring ligands that form multiple Bi-S interactions (distances ranging from 3.08 to 3.63 A) with a dimerlike unit of Bi2Br6. The electronic interaction between the porphyrin center and the Bi2Br6 block was illustrated by the diffuse-reflectance spectrum of the network compound, in which a modest red-shifted feature at 1.8 eV was seen (while the Q-band absorption of the metalloporphyrin core continues to be dominant at 1.9 eV).