Observation of reversible three-step solid-to-solid phase transitions in a nickel-bis-1,2-dithiolene magnetic molecule solid

详细信息	查看全文 | 推荐本文 |

• 作者：Shan-Shan Yu^a ; Hai-Bao Duan^a ; ; Wen-Bo Pei^a ; Xuan-Rong Chen^a ; Xiao-Ming Ren^a ; ^b ; ^{xmren@njut.edu.cn} ; Zheng-Fang Tian^a
• 关键词：Metal-bis-dithiolene complex ; Hysteretic magnetic transition ; Magnetoelastic interaction ; Crystal-to-plastic crystal transformation
• 刊名：Inorganic Chemistry Communications
• 出版年：2012
• 期刊代码：39_13877003
• 类别：ch
• 出版时间：June, 2012
• 卷：20
• 期：Complete
• 页码：307-311
• 文件大小：794 K

摘要

An ion-pair compound 1,6-bis(1-methylimidazolium)hexane bis(maleonitrio-dithiolato)nickelate was synthesized and structurally characterized. This compound crystallizes in the triclinic space group P-1, and the anions form the alternating stacks in the crystal. Reversible three-step solid-to-solid phase transitions occur at ~ 210, ~ 320 and ~ 432 K upon cooling. The entropy change of phase transition was estimated to be 25.4 J鈰匥^鈭?#xA0;1鈰?#xA0;mol^鈭?#xA0;1 and 9.97 J 鈰?#xA0;K^鈭?#xA0;1鈰?#xA0;mol^鈭?#xA0;1 for the transitions at ~ 320 and ~ 432 K, respectively. The hysteresis effect was observed in the 蠂_m-T plot for the transitions at ~ 210 and ~ 320 K. The mechanisms of transitions are discussed based on the crystal structure and thermal analyses.