Na Changyub, Lim Ae Ran
Graduate School of Carbon Convergence Engineering, Jeonju University, Jeonju 55069, South Korea.
Department of Science Education, Jeonju University, Jeonju 55069, South Korea.
ACS Omega. 2024 Jun 24;9(27):29789-29796. doi: 10.1021/acsomega.4c03446. eCollection 2024 Jul 9.
Understanding the physical properties of the organic-inorganic hybrid NH(CH)CuCl·2HO is necessary for its potential applications. Initially, the monoclinic structure of this crystal was discussed via single-crystal X-ray diffraction. Moreover, the previously unknown phase transition temperature was 350 K, as revealed by differential scanning calorimetry and powder X-ray diffraction. Attributed to ferroelasticity, domain walls were observed between the temperatures (Low) (223 K) and (High) (350 K). Furthermore, changes in chemical shifts for H and C indicated alterations in the molecular environment, whereas a notable decrease in line width was attributed to increased molecular motion freedom. Subsequently, spin-lattice relaxation times ( values) for H and C (indicative of energy transfer) were influenced by tumbling motions. The high activation energy barrier for molecular reorientation was associated with the tumbling motion of methyl groups around the triple symmetry axis. These foundational properties guide the development of efficient organic-inorganic hybrids suitable for practical applications.
了解有机-无机杂化材料NH(CH)CuCl·2HO的物理性质对其潜在应用至关重要。最初，通过单晶X射线衍射讨论了该晶体的单斜结构。此外，差示扫描量热法和粉末X射线衍射显示，先前未知的相变温度为350 K。由于铁弹性，在温度 (低温) (223 K) 和 (高温) (350 K) 之间观察到畴壁。此外，H和C化学位移的变化表明分子环境发生了改变，而线宽的显著减小归因于分子运动自由度的增加。随后，H和C的自旋-晶格弛豫时间（ 值）（指示能量转移）受到翻滚运动的影响。分子重新取向的高活化能垒与甲基围绕三重对称轴的翻滚运动有关。这些基础性质指导了适用于实际应用的高效有机-无机杂化材料的开发。
