The temperature dependences of 35Cl NQR frequencies were observed over a fairly wide range of temperature for MSnCl6·6H2O [M(II)=Mg, Ca, Mn, Co, Ni] forming isomorphous crystals (R\bar3) at room temperature. These complexes yielded unusual 35Cl NQR temperature dependence curves showing a positive temperature coefficient. This can be attributed to the existence of Cl···H–O type weak hydrogen bonds.

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When the temperature was increased from 77 K, the resonance lines became gradually weak without changing AV q and immeasurable above 215 K. ESR spectra taken at various temperatures revealed the presence of paramagnetic sites of ca. 5x 10 2<) mol -1 arising from Au(II). The small but finite concentration of Au(II) or some other reason should be responsible for the fade out phenomenon and the large Avq observed.

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