18-Membered Heterometallacyclic Gold(I) Compounds: Structural Influences of Co-crystallized Solvent

Abstract

Dedicated to Professor Heribert Offermans on the occasion of his 75 th birthday5-Lithiated 4,4-dimethyl-2-(2-thienyl)oxazoline reacted by halide and tetrahydrothiophene (THT) substitution with [AuCl(THT)] to form a cyclic trinuclear compound (1) in satisfactory yield. Spectroscopic studies and single-crystal X-ray analyses clarified the bonding within the ring system. The structure determination of two THF solvates revealed differences in the supramolecular assembly of the constituting molecules.

Photochemical Disproportionation of an AuII Pincer Complex: Synthesis and Structure of an AuI4AuIII4 Macrocycle

“…Those with four or more gold centers show a number of structural types; for example, bridging anionic ligands like amidinates tend to generate Au I 4 cycles based on near-linear L-Au-X moieties (where L and X represent neutral and anionic donors, respectively), , held together by Au···Au aurophilic interactions, as do tetrameric Au­(I) thiolates and a recently reported carbide-bridged Au 4 cycle, [Au­{μ-CW­(CO) 2 (Tp*)}] 4 . On the other hand, such interactions are absent in a number of other Au­(I) ring structures, including those based on phosphido or acetylide ligands (as in [Au­(μ-CCBu t )] 6 ), or compounds with rigid P donors and large macrocyles . In the case of 2 , the formation of a macrocycle is most easily explained by assuming a reaction sequence involving Au–Au and Au-phenyl bond cleavage.…”