W0361
Solid-State Structure of the Crown-Ether Salts of
[Au(SCN)2]-. Nathan Coker, Jeanette Krause Bauer and
R. C. Elder, Dept. of Chemistry, Univ. of Cincinnati, Cincinnati, OH
45221-0172.
Recent work has shown that the salts of
[Au(SCN)2]- form dimeric and oligomeric structures. As the
size of the cation increases the oligomeric structure breaks down and dimer and
monomer formation occurs. The tetraphenylphosphonium salt forms a monomer. In
contrast, the tetrabutylammonium salt forms a dimer with the cations surrounding
the anion; thereby preventing chain formation as seen for the alkali salts. To
further understand how the size of the cation affects dimer and oligomer
formation, the alkali and ammonium salts were crystallized in the presence of
crown ethers. The sodium and potassium dibenzo-18-crown-6 and potassium
18-crown-6 complexes are presented. Comparison with the uncomplexed salts shows
little variation in the structural features of the
[Au(SCN)2]- anion, the only major difference is the lack
of oligomer formation.