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The structures of KzPtCI4 and KzPdCI4 have been determined with improved accuracy. The Pt-CI distance is 2.308 (2) A,, or 2.316 A, after correction for thermal motion; the corresponding values for Pd-CI are 2-313 (2) A, and 2.318/~. In both compounds the K-CI distances are 2.40 A, and the closest CI-CI distances 3-27/~,. After correcting for absorption and some minor causes of variation, and after allowing for statistical counting errors, there remained a variation of about 2 % between the measured amplitudes of symmetry-related reflexions. This variation is approximately equal to the conventional R-value, and has no obvious explanation. Corrections for absorption and for anomalous dispersion have little effect on the calculated positions of the atoms, but have large effects on the e.s.d.'s and on the thermal parameters; they are therefore essential if corrections for thermal vibration are to be calculated.

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