Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 2 (February 2002)

Acta Cryst. (2002). C58, m111-m115    [doi:10.1107/S0108270101020364]

Platinum complexes of oxopurines: cis-bis(theophyllinato-N⁷)bis(triphenylphosphine)platinum(II) and cis-chloro(theobrominato-N¹)bis(triphenylphosphine)platinum(II) ethanol hemisolvate

E. Dubler, H. W. Schmalle, F. Arod and A. Schneider

Abstract: The syntheses and structures of two mixed-ligand complexes of platinum(II) with deprotonated oxopurine bases and triphenylphosphine are reported, namely the theophyllinate complex cis-bis(1,2,3,6-tetrahydro-1,3-dimethylpurine-2,6-dionato-N⁷)bis(triphenylphosphine-P)platinum(II), [Pt(C₇H₇N₄O₂)₂(C₁₈H₁₅P)₂], (I), and the theobrominate complex cis-chloro(1,2,3,6-tetrahydro-3,7-dimethylpurine-2,6-dionato-N¹)bis(triphenylphosphine-P)platinum(II) ethanol hemisolvate, [PtCl(C₇H₇N₄O₂)(C₁₈H₁₅P)₂]·0.5C₂H₅OH, (II). In (I), the coordination geometry of Pt is square planar, formed by the two coordinating N atoms of the theophyllinate anions in a cis arrangement and two P atoms from the triphenylphosphine groups. In (II), there are two crystallographically independent molecules. They both exhibit a square-planar coordination geometry around Pt involving one Cl atom, the coordinating N atom of the theobrominate anion and two P atoms from the triphenylphosphine groups. The two triphenylphosphine groups are arranged in a cis configuration in both structures. The heterocyclic rings are rotated with respect to the coordination plane of the metal by 82.99  (8) and 88.09  (8)° in complex (I), and by 85.91  (16) and 88.14  (18)° in complex (II). Both structures are stabilized by intramolecular stacking interactions involving the purine rings and the phenyl rings of adjacent triphenylphosphine moieties.

Formula: [Pt(C₇H₇N₄O₂)₂(C₁₈H₁₅P)₂] and [PtCl(C₇H₇N₄O₂)(C₁₈H₁₅P)₂]·0.5C₂H₆O

Online 23 January 2002

	Structure factor file (CIF format) (645.5 kbytes) Contains datablock I
	Structure factor file (CIF format) (977.0 kbytes) Contains datablock II

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