The crystal structures and absolute configurations of the anti-tumor complexes Pt(oxalato)(1R,2R-cyclohexanediamine) and Pt(malonato)(1R,2R-cyclohexanediamine)

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Abstract

The absolute configurations of the anti-tumor complexes [Pt(oxalato)(trans-l-dach)] and [Pt(malonato) (trans-l-dach)] (trans-l-dach = 1R,2R-cyclohexanediamine) have been determined by X-ray anomalous scattering techniques. These complexes are particularly interesting because they show higher anti-tumor activity than the corresponding Pt complexes with other 1,2-cyclohexanediamine(dach) ligands, namely those with trans-d-dach (1S,2S-dach) or cis-dach (1R,2S-dach). The oxalato and malonato ligands are found to bind to the Pt atom in a chelating fashion, through one oxygen atom from each of the two carboxylate groups. Crystallographic details: Pt(oxalato)(trans-l-dach): space group P21 (monoclinic); a = 11.230(11) Å, b = 9.914(5) Å, c = 4.716(3) Å, β = 90.86(6)°; R = 4.0% for 1256 reflections. Pt(malonato)(trans-l-dach): space group P21 (monoclinic); a = 11.568(5) Å, b = 10.007(5) Å, c = 5.187(3) Å, β = 99.16(4)°; R = 4.8% for 1675 reflections. © 1984.

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Bruck, M. A., Bau, R., Noji, M., Inagaki, K., & Kidani, Y. (1984). The crystal structures and absolute configurations of the anti-tumor complexes Pt(oxalato)(1R,2R-cyclohexanediamine) and Pt(malonato)(1R,2R-cyclohexanediamine). Inorganica Chimica Acta, 92(4), 279–284. https://doi.org/10.1016/S0020-1693(00)80051-1

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