A second polymorph of chlorido(hydroxy-diphenyl-phosphane)gold(I).

Area of Science:

• Inorganic Chemistry
• Crystallography
• Materials Science

Background:

• The study investigates a specific gold(I) complex, [AuCl{(C(6)H(5))(2)P(OH)-κP}], identified as a new polymorph.
• This new polymorph is compared to a previously reported crystal structure of the same complex.

Purpose of the Study:

• To characterize the crystal structure of the new gold(I) complex polymorph.
• To analyze the intermolecular interactions, specifically gold-gold (Au⋯Au) interactions.
• To investigate the influence of intramolecular hydrogen bonding on the coordination geometry around the gold center.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the crystal structure.
• Analysis of bond lengths, bond angles, and intermolecular distances was performed.
• Comparison of structural parameters with a previously reported polymorph.

Main Results:

• The crystal structure contains two independent molecules in the asymmetric unit.
• Distinct intermolecular Au⋯Au interactions were observed with alternate distances of 3.0112(3) Å and 3.0375(2) Å.
• The Cl-Au-P bond angle exhibits significant variation (179.23(3)° to 170.39(4)°) due to intramolecular O-H⋯Cl hydrogen bonding, differing from the prior polymorph.

Conclusions:

• The identified polymorph exhibits unique structural features, including specific Au⋯Au interactions and variable coordination geometry.
• Intramolecular hydrogen bonding plays a crucial role in modulating the molecular structure and crystal packing.
• The findings contribute to understanding polymorphism and structure-property relationships in gold(I) complexes.