Summary
The heat-of-transition rule, heat-of-fusion rule, infrared rule and density rule, which concern the relative stability of polymorphic molecular crystals, have been checked experimentally. Among the 228 transitions examined, there are only few exceptions, and these mainly concern the infrared and density rules. The heat-of-transition and heat-of-fusion rules, however, give the right result in more than 99% of cases. If certain restrictions are observed, the other rules are also fairly reliable. By their means the stability relations in polymorphic systems can easily be clarified. Data are given for 113 polymorphic substances.
Zusammenfassung
Die früher formulierte Umwandlungswärmeregel, Schmelzwärmeregel, IR-Regel und Dichteregel, die sich mit der relativen Stabilität polymorpher Molekülkristalle befassen, wurden nun experimentellen Ergebnissen gegenübergestellt. Unter den 228 überprüften Umwandlungen befinden sich nur wenige Ausnahmen, die hauptsächlich die IR- und Dichteregel betreffen. Die Umwandlungs- und Schmelzwärmeregel hingegen ergeben in mehr als 99% der Fälle das richtige Resultat. Mit einigen Einschränkungen sind auch die beiden anderen Regeln recht zuverlässig. Damit kann man nun die Stabilitätsverhältnisse in polymorphen Systemen leichter klären. Daten für 113 polymorphe Substanzen sind angegeben.
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Burger, A., Ramberger, R. On the polymorphism of pharmaceuticals and other molecular crystals. II. Mikrochim Acta 72, 273–316 (1979). https://doi.org/10.1007/BF01197380
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DOI: https://doi.org/10.1007/BF01197380