Importance

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Abstract

Compounds of formula (I) ?M.sub.6 Q.sub.8 B.sub.n L.sub.6-n !.sup.x where M is Re or Rh; each Q is a bridging atom selected from O, S, Se and Te; B is a monovalent non-bridging atom or moiety; L is a PR.sub.3 group in which R is C.sub.1-6 alkyl or aryl, optionally substituted on the alkyl or aryl group by one or more water-solubilizing groups such as an amine or hydroxidy group, or the three R groups together form a C.sub.6-10 trivalent group which may also contain up to three nitrogen or oxygen atoms; n is an integer from 0 to 6; and x is an integer from -2 to +4, representing the overall charge of the cluster, which when non-zero is accompanied by one or more counter ions of equal and balancing charge, and contrast media, particularly X-ray contrast media, containing them.

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First Claim