Reaction of the platinum(II) acetylacetonate Pt(acac)(2) with CO(OOCMe)(2) center dot 4H(2)O in air produced the Pt-11-Co-II heterodimetallic complex {Pt-11(acac)}(2)Co-11(P-OOCMC)(4) as established by single-crystal X-ray diffraction. (c) 2007 Elsevier B. V. All rights reserved.