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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
Diplatinum(III) complexes with four bridging 1-methylcytosinato nucleobases derived from a mononuclear
Jens Müller1, Eva Freisinger, Pablo J Sanz Miguel
1Fachbereich Chemie, Universität Dortmund, D-44221 Dortmund, Germany. jens.mueller@uni-dortmund.de
Abstract:
A heteronuclear complex of composition trans-[(NH(3))(2)Pt(N4-1-MeC(-)-N3)(2)Cu(H(2)O)(2)](ClO(4))(2) (1a), with 1-MeC(-) = 1-methylcytosinate, has been prepared and characterized by X-ray crystallography. 1a (Cu,Pt) is a linkage isomer of a previously described compound with the two metals inverted (Pt,Cu). The intermetallic distances are significantly different in the two types of compounds, 2.6109(9) A in 1a, yet 2.49-2.56 A in several forms of the linkage isomer. When heated in water in the presence of air, 1a is converted in low yield into diplatinum(III) compounds [(H(3)N)Pt(1-MeC(-)-N3,N4)(4)Pt(NH(3))](2+) (2a) and [(H(2)O)Pt(1-MeC(-)-N3,N4)(4)Pt(NH(3))](2+) (2b), which were crystallized as ClO(4)(-) salts. In a modified procedure a third representative of this group of diplatinum(III) compounds, [(O(2)N)Pt(1-MeC(-)-N3,N4)(4)Pt](+) (2c) was isolated. All three compounds contain the four bridging 1-MeC ligands in a head,tail,head,tail arrangement with Pt-Pt distances (2.4516(7)-2.4976(9) A) that are the shortest ones among diplatinum(III) compounds containing nucleobases.
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