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Heat Capacity and Thermodynamic Properties of Crystalline 2‐Chloro‐ N , N ‐dimethylnicotinamide
Author(s) -
Sun XiaoHong,
Liu YuanFa,
Tan ZhiCheng,
Ji PengJu,
Wang MeiHan
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200591490
Subject(s) - chemistry , heat capacity , entropy of fusion , enthalpy , enthalpy of fusion , calorimetry , adiabatic process , thermodynamics , fusion , atmospheric temperature range , differential scanning calorimetry , calorimeter (particle physics) , melting temperature , mass fraction , standard molar entropy , analytical chemistry (journal) , melting point , organic chemistry , linguistics , physics , philosophy , materials science , detector , electrical engineering , composite material , engineering
Low‐temperature heat capacities of 2‐chloro‐ N , N ‐dimethylnicotinamide were precisely measured with a high‐precision automated adiabatic calorimeter over the temperature range from 82 K to 380 K. The compoundwas observed to melt at (342.15±0.04) K. The molar enthalpy Δ fusion H m , and entropy of fusion, Δ fusion S m , as well as the chemical purity of the compound were determined to be (21387±7) J·mol −1 , (62.51±0.01) J·mol −1 ·K −1 , (0.9946±0.0005) mass fraction, respectively. The extrapolated melting temperature for the pure compound obtained from fractional melting experiments was (342.25±0.024) K. The thermodynamic function data relative to the reference temperature 298.15 K were calculated based on the heat capacity measurements in the temperature range from 82 to 325 K. The thermal behavior of the compound was also investigated by different scanning calorimetry.