Synthesis and structure of the hexameric, dodecanuclear metallamacrocycle [(5-methyl-3-phenylpyrazole)2Zn2(OCH2CH2S)]6

A metallamacrocycle containing twelve Zn2+ ions, making it the largest member of a family of pyrazole-bridged cyclic metal clusters, has been synthesized and structurally characterized from the reaction of [Zn(ClO4)2] with 5-methyl-3-phenylpyrazole, 2-mercaptoethanol, and NaOH.