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1
Solid State Characterization of Pharmaceuticals
ENANTIOTROPY MONOTROPY E N E R G Y G T o A B Temperature
E N E R G Y G A B TAf TBf melt Temperature Figure 4.19 The Relationship
between Gibbs energy (G) and temperature for two modifications in the cases of
enantiotropy ...
Richard A. Storey, Ingvar Ymén, 2011
2
Polypropylene. 1. Structure and morphology
3.5 POLYMORPHISM IN IPP There are two types of polymorphism: monotropy
and enantiotropy. The difference between them is usually illustrated by the
temperature dependence of the free enthalpy, G [262, 263] Figure 3.16 shows the
...
In enantiotropy, the polymorphs have a transition point below the melting points,
such that, on crossing the transition point, the relative stability of the polymorphs
is inverted. This thermodynamic distinction is based on the assumption that the ...
Kenneth W. Busch, Marianna A. Busch, 2011
4
Engineering Chemistry I (for BPUT)
Allotropy Depending on the type of changes that occurs between different forms
of a substance, allotropy is of three types: (i) Enantiotropy (ii) Monotropy (iii)
Dynamic allotropy Enantiotropy: The different polymorphic forms of a substance
which ...
B.B. Patra, Biswajit Samantray, Patra B.B.
5
Polymorphism: In the Pharmaceutical Industry
2.4 Thermodynamic Relationship Between Polymorphs: Enantiotropy and
Monotropy Lehmann, in 1888, coined the terms enantiotropy and monotropy to
distinguish two different types of polymorphic behavior [27]. Two types of graphs
are ...
6
Handbook of Thermal Analysis and Calorimetry: From ...
In enantiotropy, there is a reversible transition temperature between the two
forms [12]. The lower melting point form is stable below the transition point but at
higher temperatures the polymorph with the higher melting point is the stable
form.
7
Pharmaceutical Salts and Co-crystals
DSC Melting point; heat of Moisture sorp- Moisture sorption tion analysis
isothenn AH (monotropy vs. enantiotropy via heat of fusion rule); T , by
extrapolation AH (monotropy vs. enantiotropy via heat of transition rule) AH (
monotropy vs.
Johan Wouters, Luc Quere, David E. Thurston, 2011
emanation | enantiotropy 79 material into fractions of various sizes by permitting it
to settle against upward moving stream of fluid, generally air or water. i
emanation an obsolete name for radon. i emission spectrum a spectrum formed
by a ...
9
Crystallization: Basic Concepts and Industrial Applications
(a). (b). Enantiotropy. Monotropy. C C sat sat. TI. T. T. In Figure 3.20, solubility
curves of a certain pharmaceutical intermediate in different organic solvents and
solvent mixtures are shown. They are presented together with the ideal
solubilities ...
10
A Text Book of Inorganic Chemistry
Properties — Tin exhibits enantiotropy among its three allotropic forms. U.2°C v
U.I C Grey tin < ) White tin < ) Rhombic tin (sp. gr. 5.76) (sp. gr. 7.30) (sp. gr. 9.65)
(a) Grey tin — This is formed as a grey powder when white tin is cooled below ...
