Abstract

The successful and rapid elucidation of this structure by the use of the anomalous dispersion data, as described above, does raise the question as to the efficiency of other methods of structure solution in this situation. This has prompted us to apply three such approaches to the data and the results of the comparison we then made are presented below. In view of the assumption that the ambiguity in phase angle implicit in the anomalous data could be removed by choosing values nearer to the phase contribution of the cobalt atom itself, we tried two other means of dealing with these data which did not require such an approximation. These were the β an function of Ramachandran & Raman (1956) and the P s ( u ) function of Pepinsky & Okaya (1956). At the same time a closer study was made of the heavy atom phased synthesis. The results obtained are illustrated by table 7 and figure 11 a to e .

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