ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Phosphanyl-substituted siloles: synthesis, structural characterization and an unexpected secondary isotope effect in the ³¹P NMR spectrum at room temperature

Balázs Szathmári, Máté Lauer, Tamás Holczbauer, Bence Balterer, Attila Domján, Balázs Volk, Ilona Kovács, and Zsolt Kelemen

Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Budapest, Hungary

E-mail: kovacs.ilona@vbk.bme.hu

Received: 15 December 2025  Accepted: 3 April 2026

Abstract:

We report the synthesis and characterization of a series of phosphanyl-substituted siloles, in which the effects of substituents at the phosphanyl units were examined, including both electronic and steric factors. The structural features of these new siloles were investigated using NMR spectroscopy, single-crystal X-ray diffraction and DFT calculations. For the halogen-substituted derivatives, an unexpected ³⁵Cl/³⁷Cl secondary isotope effect is observed in the ³¹P{¹H} NMR spectra even at room temperature.

Graphical abstract

Keywords: Siloles; Phosphanes; NMR studies; SC-XRD structures; Secondary isotope effect

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-026-04878-3

Chemical Papers 80 (7) 8139–8148 (2026)