Large ring mononuclear compounds of platinum and iridium involving the trans-co-ordinating ligands But2P[CH2]xPBut2(x= 9 or 10), and large ring binuclear complexes are described; it is suggested that mononuclear bidentate complexes with a large ring might be more stable than those with an intermediate size ring.
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Pryde et al. (1973) studied this question.