Fourteen new structural phase transitions are detected in layer-type monoalkylammonium hexachlorostannates (C,H,,+,NH,),SnCI, (n = 2 to 8) by means of differential scanning calorimetry. The basic thermodynamic data are determined for the transitions. The infrared spectra of the compounds are measured in the range of molecular vibrations (500 to 4000cm-') at room temperature and in dependence on temperature (77 to 298 K) by the method of nujol mull.Vierzehn neue strukturelle Phasenumwandlungen werden in geschichteten Monoalkylammoniumhexachlorostannaten (C,H,,+ ,NH,),SnCI, (n = 2 bis 8) mittels dynamischer Leistungs-Differenzkalorimetrie entdeckt. Es werden die thermodynamischen Grunddaten fur diese Umwandlungen ermittelt. Die Infrarotspektren dieser Verbindungen werden im Bereich der Molekiilschwingungen (500 bis 4000 cm-') bei Raumtemperatur und in Abhangigkeit von der Temperatur (77 bis 298 K) mit Hilfe einer Nujolsuspension gemessen.
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