Colorimetric detection of small molecules by a frustrated lewis pair containing a phosphorus-functionalized cycloheptatrienyl-cyclopentadienyl titanium sandwich complex

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Abstract

The phosphorus-functionalized cycloheptatrienyl-cyclopentadienyl (Cht-Cp) titanium sandwich complex [(η7-C7H7)Ti(η5-C5H4PtBu2)] (7) forms a frustrated Lewis pair (FLP) in combination with the borane B(C6F5)3, and this FLP undergoes heterolytic cleavage of dihydrogen and fixation of carbon dioxide and nitrous oxide with a noticeable colorimetric response, which is visible to the naked eye. In their UV/Vis spectra, the H2, CO2 and N2O fixation products exhibit a bathochromic shift of the absorption band that can be assigned to a HOMO-LUMO excitation of the Cht-Cp titanium (troticene) moiety.

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Theuergarten, E., Tagne Kuate, A. C., Freytag, M., & Tamm, M. (2015). Colorimetric detection of small molecules by a frustrated lewis pair containing a phosphorus-functionalized cycloheptatrienyl-cyclopentadienyl titanium sandwich complex. Israel Journal of Chemistry, 55(2), 202–205. https://doi.org/10.1002/ijch.201400147

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