The alkaline earth hexammines have novel structures and molecular motions. The ammonia molecules in these compounds adopt an entirely different geometry from that of normal ammonia. There are two motional transitions as the temperature is increased. The first transition is due to ammonia rotation, and the second results from ammonia diffusion.
The size distribution and ESR of uniform platinum microcrystals have been investigated. The mean size is typically about 20 Å, with a standard deviation of less than 4 Å. The sizes follow a log-normal distribution, with σ =1.2 ± 0.02. An ESR signal has been observed in the range 17-291 K and is attributed to the platinum microcrystals. The g-factor is 2.001 9 ± 0.000 2, and the width is about 20 G. The temperature dependence of the ESR susceptibility is in good agreement with a Curie law. The lineshape, g-factor, and linewidth are independent of temperature and microwave power and frequency, and the ESR signal saturates with increasing power. This behaviour is interpreted in terms of an inhomogeneously broadened line having a negligible spin-packet width where the overall linewidth may result from hyperfine broadening
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