Notes 4139 to BTMA, has a higher moment although deviation from a smooth curve in its susceptibility-temperature characteristic may reflect relatively large changes in the effective ligand field with temperature. Indeed, the increasing divergence of the susceptibilities of all the compounds studied with increasing temperature suggest that the ligand field strength and/or symmetry is markedly temperature dependent. In view of the complexity of the crystal structure, this behavior is not surprising.

Mlile all the thallium (I) halides have been studied, 1 only two gaseous ternary compounds of monovalent thallium, thallium (I) nitrate 2 and thallium (I) sulfate, 3 have been reported so far. The purpose of this work was to extend the range of known gaseou5 ternary compounds of thallium (I) and to compare their mass spectrometric behavior to that of the corresponding alkali compm.mds. We have therefore examined the vapors above thallium (I) retaborate and an equimolar mixture of thallium (I) fluoride and aluminum fluoride.

Die begrifflichen Grundlagen zweier Analysen der Dampfphasenkeimbildung werden untersucht.