Copper(I)−Purine−Phosphine Complexes. Syntheses and Molecular Structures of [Cu2(μ-HL1)2(μ-dppm)(η1-dppm)2] and {[Cu3(μ3-Cl)2(μ-dppm)3][Cu(HL2)2]} (H2L1= 8-Mercaptotheophylline and H2L2= 8-Ethyl-3-methylxanthine)

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Abstract
The syntheses and molecular structures of two novel polynuclear copper(I)−purine−phosphine complexes are reported. The first one is a dinuclear [Cu2(μ-HL1)2(μ-dppm)(η1-dppm)2] complex (H2L1 is 8-mercaptotheophylline). The compound crystallizes in the triclinic system, space group P1̄, with cell constants a = 12.342(5) Å, b = 15.255(5) Å, c = 24.972(5) Å, α = 74.31(2)°, β = 78.62(2)°, γ = 72.51(2)°, and Z = 2. The structure of this complex exhibits as the most important feature the simultaneous presence of η1-terminal and η2-bridging dppm ligands, which is first here described for a copper complex. This complex is also of interest because of its reversible photochromic behavior in the solid state. The second compound is an ionic {[Cu3(μ3-Cl)2(μ-dppm)3][Cu(HL2)2]} complex (H2L2 is 8-ethyl-3-methylxanthine), which crystallizes in the monoclinic system, space group P21/n, with cell constants a = 15.829(6) Å, b = 22.801(7) Å, c = 28.569(6) Å, β = 97.65(4)°, and Z = 6. The structure of this complex consists of trinuclear copper(I) cations and mononuclear [Cu(purine)2]- anions, exhibiting a linear stereochemistry. As far as we know, this compound represents the first example of a copper(I)−purine complex whose structure has been determined by X-ray crystallography.

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