Thermal properties and crystal structures of cobalt(III)-cyclam complexes with the bis(trifluoromethanesulfonyl)amide anion (cyclam = 1,4,8,11-tetraazacyclotetradecane)

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• 作者：Yukiko Oba ; Tomoyuki Mochida ; ^{tmochida@platinum.kobe-u.ac.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Cyclam complex ; Cobalt ; Thermal analysis ; Crystal structure ; Hydrogen bond
• 刊名：Polyhedron
• 出版年：2015
• 出版时间：15 October 2015
• 年：2015
• 卷：99
• 期：Complete
• 页码：275-279
• 全文大小：504 K

文摘

The bis(trifluoromethanesulfonyl)amide anion ([Tf₂N]⁻) has frequently been used as a component of ionic liquids. To investigate the effect of this anion and alkyl substituents on the thermal properties of macrocyclic metal complexes, cobalt(III) cyclam complexes [Co(cyclam)Cl₂][Tf₂N] and its monoalkyl derivatives were prepared (cyclam = 1,4,8,11-tetraazacyclotetradecane). The corresponding hexafluorophosphate salts were also prepared and characterized. The salts with propyl and hexyl substituents melted at 171 °C and 153 °C, respectively, whereas other salts decomposed above 220 °C without melting. X-ray crystallography revealed the formation of intermolecular hydrogen bonds involving the NH hydrogens, which are responsible for the high melting points.