Crystallization experiments with the dinuclear chelate ring complex di-μ-chlorido-bis[(η2-2-allyl-4-methoxy-5-{[(propan-2-yloxy)carbonyl]methoxy}phenyl-κC1)platinum(II)].

Abstract

Crystallization experiments with the dinuclear chelate ring complex di-μ-chlorido-bis­[(η2-2-allyl-4-meth­oxy-5-{[(propan-2-yl­oxy)carbon­yl]meth­oxy}phenyl-κC1)platinum(II)], [Pt2(C15H19O4)2Cl2], containing a derivative of the natural compound eugenol as ligand, have been performed. Using five different sets of crystallization conditions resulted in four different complexes which can be further used as starting compounds for the synthesis of Pt complexes with promising anti­cancer activities. In the case of vapour diffusion with the binary chloro­form–diethyl ether or methyl­ene chloride–diethyl ether systems, no change of the mol­ecular structure was observed. Using evaporation from aceto­nitrile (at room temperature), di­methyl­formamide (DMF, at 313 K) or dimethyl sulfoxide (DMSO, at 313 K), however, resulted in the displacement of a chloride ligand by the solvent, giving, respectively, the mononuclear complexes (aceto­nitrile-κN)(η2-2-allyl-4-meth­oxy-5-{[(propan-2-yl­oxy)carbon­yl]meth­oxy}phenyl-κC1)chlorido­platinum(II) monohydrate, [Pt(C15H19O4)Cl(CH3CN)]·H2O, (η2-2-allyl-4-meth­oxy-5-{[(propan-2-yl­oxy)carbon­yl]meth­oxy}phenyl-κC1)chlorido­(di­methyl­formamide-κO)platinum(II), [Pt(C15H19O4)Cl(C2H7NO)], and (η2-2-allyl-4-meth­oxy-5-{[(propan-2-yl­oxy)carbon­yl]meth­oxy}phenyl-κC1)chlorido­(dimethyl sulfoxide-κS)platinum(II), determined as the analogue {η2-2-allyl-4-meth­oxy-5-[(ethoxycarbonyl)meth­oxy]phenyl-κC1}chlorido­(dimethyl sulfoxide-κS)platinum(II), [Pt(C14H17O4)Cl(C2H6OS)]. The crystal structures confirm that aceto­nitrile inter­acts with the PtII atom via its N atom, while for DMSO, the S atom is the coordinating atom. For the replacement, the longest of the two Pt—Cl bonds is cleaved, leading to a cis position of the solvent ligand with respect to the allyl group. The crystal packing of the complexes is characterized by dimer formation via C—H⋯O and C—H⋯π inter­actions, but no π–π inter­actions are observed despite the presence of the aromatic ring.