Acta Cryst. (2001). E57, m595-m596  [ doi:10.1107/S1600536801019419 ]

Double cyclometallation of bis[3-(3-bromophenyl)pyrazol-1-yl]methane in the bis[acetylacetonatopalladium(II)] complex

O. Juanes, J.-C. Rodriguez-Ubis and C. J. Pastor

Abstract: The cyclometallation of aryl and pyrazolyl rings yields the bis[acetylacetonatopalladium(II)] complex, [Pd₂(C₅H₇O₂)₂C₁₉H₁₂Br₂N₄)]·0.5C₂H₃N, with five- and six-membered chelate rings. The five-membered ring PdNCCC [Pd-C 1.969  (9) and Pd-N 2.013  (8)  Å] is planar, whereas the six-membered ring PdNNCNC [Pd-C 1.971  (9) and Pd-N 2.023  (7)  Å] has a boat conformation. The Pd-O(acac) distances clearly demonstrate a trans influence, the O atoms in trans positions to carbon forming longer Pd-O bonds than those in trans positions to nitrogen [Pd-O 2.092  (6)  Å versus 2.014  (6)  Å for the Pd atom in the five-membered ring and 2.044  (7)  Å versus 1.999  (6)  Å for the Pd atom in the six-membered ring].

Online 24 November 2001

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