Substituent effects in pyridyl-functionalized pyrylium salts, pyridines and λ32-phosphinines: a fundamental and systematic study

Antonia Loibl, Wiebke Oschmann, Maria Vogler, Evgeny A. Pidko, Manuela Weber, Jelena Wiecko, Christian Müller

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)


A series of substituted, pyridyl-functionalized 2,4,6-triarylpyrylium salts were prepared and investigated for their light absorption and emission properties. After reaction with P(SiMe3)3, the corresponding λ3-phosphinines were obtained, which carry on the 4- or 6-aryl ring ±I and ±M substituents. Supported by DFT calculations, a systematic evaluation of the σ-donor and π-donor as well as π-acceptor properties of these low-coordinate P,N-hybrid ligands was performed. The modular synthetic approach allowed us at the same time to synthesize the structurally related bipyridine derivatives for comparison reasons. Reaction of the chelating ligands with [W(CO)6] in THF afforded the corresponding [(P^N)W(CO)4] and [(N^N)W(CO)4] complexes. A crystallographic characterization of selected coordination compounds revealed significant structural differences between the pyridyl-phosphinine- and the bipyridine-based compounds. Their characterization by means of IR-spectroscopy gave experimental insight into the electronic properties of the respective ligands.

Original languageEnglish
Pages (from-to)9355-9366
JournalDalton Transactions
Issue number28
Publication statusPublished - 2018
Externally publishedYes


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