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A trigonal coordination of Au(I) phosphane complexes stabilized by O-H X (X = Cl-, Br-, I-) interactions. 2021

Petra Gründlinger, and Cezarina Cela Mardare, and Thorsten Wagner, and Uwe Monkowius
Institute of Experimental Physics-Surface Science Division, Johannes Kepler University Linz, Altenberger Straße 69, 4040 Linz, Austria.

In this work, we show that intramolecular hydrogen bonding can be used to stabilize tri-coordinated phosphane-gold(I) complexes. Two molecular structures of 2-(diphenylphosphino)benzoic acid (L) coordinated to a gold(I) atom were determined by single-crystal X-ray diffraction. The linear L-Au-Br shows a standard linear coordination and dimerizes via hydrogen bonds of the carboxylic acid. Upon addition of two additional phosphane ligands the complex [L3Au]X is formed which is stabilized by three intramolecular -C(O)O-H X hydrogen bonds as proven by the X-ray structure of the respective chlorido-complex. X-ray powder diffractograms suggest the same structure also for X- = Br- and I-. BACKGROUND The online version contains supplementary material available at 10.1007/s00706-021-02843-2.

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