Spectral studies of cobalt(III) complexes of heterocyclic 3-azacyclothiosemicarbazones and the structure of the acetylpyrazine 3-azabicyclo[3.2.2]nonylthiosemicarbazone complex

✍ Scribed by Cecilia Maichle; Alfonso Castineiras; Rosa Carballo; Haileselassie Gebremedhin; Mark A. Lockwood; Christopher E. Ooms; Timothy J. Romack; Douglas X. West

• Publisher: Springer
• Year: 1995
• Tongue: English
• Weight: 600 KB
• Volume: 20
• Category: Article
• ISSN: 0340-4285
• DOI: 10.1007/bf00143482

✦ Synopsis

Cobalt(III) complexes of 2-acetylpyridine 3-pyrrolidinyl-, 3-piperidinyl-, 3-hexamethylcneiminyl-and 3-azabicyclo-

]BF 4 and I-Co(bcn)2]BF 4, respectively; and aceylpyrazine 3-azabicyclo[3.2.2]nonylthiosemicarbazone, [Co(Pzbcn)2]BF4, have been synthesized and their spectral properties measured. The 1H-and 13C-n.m.r. spectra show the uncomplexed thiosemicarbazones to be mixtures of as many as three isomers, and that the two ligands in the cobalt(III) complexes are nearly identical. The crystal structure of [Co(Pzbcn)z]BF 4 shows the two ligands coordinated in a mer-configuration. Bond lengths and angles in this complex are compared with data previously reported for thiosemicarbazone complexes.