Hydrogen Bonded Supra Molecular Structure as studied by Positron Annihilation Spectroscopy

摘要：

Hydrogen bonded supra molecular structure is the essential feature of cinnamic acid (phenyl acrylic acid) while forming a layered crystal structure in solid state. It is an aromatic compound with strong hydrogen bonding between the carboxylic groups. The dimers are interconnected by CH….O intermolecular hydrogen bonds, with C-H unit mostly originating from aromatic ring. These bonds keep the dimers and higher oligomers together and thus the compound exists in crystalline form. Since the hydrogen bonded structure is susceptible to rupture at temperature changes above the ambient, a temperature dependent positron annihilation spectroscopic study has been performed to investigate the changes of its molecular structure. These subtle changes were investigated independently through differential scanning calorimetry (DSC), which sheds light on the activation energy of the molecular state at different temperature regimes and indicates the phase transition temperature.

关键词： Cinnamic acid layered structure positron annihilation spectroscopy hydrogen

作者: Bichitra Nandi Ganguly

作者单位: Saha Institute of Nuclear Physics,1/AF Bidhannagar,Kolkata-700 064,India

会议类型: 国际会议

会议名称: 第九届国际正电子与正电子素国际会议(9th International Workshop on Positron and Positronium Chemistry)(PPC–9)

会议地点: 武汉

会议语种:英文

页码: 227-231

在线出版日期: 2008-05-11（万方平台首次上网日期，不代表论文的发表时间）