Surninary Contrary to recent interpretations, it is demonstrated by 1S3W n.m.r. and by VIv e.s.r. spectroscopy that: (i) the a2 isomer of [(P04)2Wl,0,3]10-, and its a,OJ3-by absence of a W atom from one of the 3-fold W30,, groups which cap the ends of the latter complex, rather than by removal or substitution of one W atom from the 12 which are around the complex's 'belt'; and(ii) ~-[(Po4)~w180~]s-differs from its a isomer by a 60' rotation, about its 3-fold axis, of one of the 'cap' W3013 groups rather than by a 60° rotation of one PW, 'halfunit' relative to the other one.
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