Heat capacities of alpha-, beta-, and gamma- polymorphs of glycine

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F24%3A00602402" target="_blank" >RIV/61389013:_____/24:00602402 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/1420-3049/29/22/5366" target="_blank" >https://www.mdpi.com/1420-3049/29/22/5366</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/molecules29225366" target="_blank" >10.3390/molecules29225366</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Heat capacities of alpha-, beta-, and gamma- polymorphs of glycine

Popis výsledku v původním jazyce

As a part of our effort to establish reliable thermodynamic data for amino acids, the heat capacity and phase behavior are reported for two stable polymorphs (α and γ) of glycine (aminoacetic acid, CAS RN: 56-40-6). Prior to heat capacity measurement, thermogravimetric analysis and X-ray powder diffraction were performed to determine decomposition temperatures and initial crystal structures, respectively. The literature heat capacities obtained by adiabatic calorimetry are available in the temperature interval (7–304). The literature data were used for validating performance of our relaxation (heat-pulse) calorimeter, which was used for measurement of the heat capacity of α-glycine in the temperature interval (2–267) K. The crystal heat capacities of the α- and γ-glycine were extended towards higher temperatures using Tian–Calvet calorimetry in the temperature interval (262–358) and power compensation DSC in the temperature interval (310–449) K. As a result, reference heat capacities and thermodynamic functions for the crystalline phase from 0 K up to 450/435 K for α/γ-glycine were developed. The literature heat capacities for β-glycine over the range 0 K to 295 K were treated in the same manner in order to provide thermodynamic data for all three polymorphs existing at the atmospheric pressure.

Název v anglickém jazyce

Heat capacities of alpha-, beta-, and gamma- polymorphs of glycine

Popis výsledku anglicky

As a part of our effort to establish reliable thermodynamic data for amino acids, the heat capacity and phase behavior are reported for two stable polymorphs (α and γ) of glycine (aminoacetic acid, CAS RN: 56-40-6). Prior to heat capacity measurement, thermogravimetric analysis and X-ray powder diffraction were performed to determine decomposition temperatures and initial crystal structures, respectively. The literature heat capacities obtained by adiabatic calorimetry are available in the temperature interval (7–304). The literature data were used for validating performance of our relaxation (heat-pulse) calorimeter, which was used for measurement of the heat capacity of α-glycine in the temperature interval (2–267) K. The crystal heat capacities of the α- and γ-glycine were extended towards higher temperatures using Tian–Calvet calorimetry in the temperature interval (262–358) and power compensation DSC in the temperature interval (310–449) K. As a result, reference heat capacities and thermodynamic functions for the crystalline phase from 0 K up to 450/435 K for α/γ-glycine were developed. The literature heat capacities for β-glycine over the range 0 K to 295 K were treated in the same manner in order to provide thermodynamic data for all three polymorphs existing at the atmospheric pressure.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Molecules

ISSN

1420-3049

e-ISSN

1420-3049

Svazek periodika

29

Číslo periodika v rámci svazku

22

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

14

Strana od-do

5366

Kód UT WoS článku

001365279200001

EID výsledku v databázi Scopus

2-s2.0-85210179706