Intermolecular stacking of a tetranuclear cyclic Pt(II) complex: NMR characterization and X-ray crystal structure of cis-trans-cis-trans tetra[μ-2,6-diethynyl-4-nitroaniline-bis(tri(p-tolyl)phosphine)platinum(II)] |
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| Authors: | Ilaria Fratoddi Maurizio Delfini Michael B Hursthouse Maria V Russo |
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| Institution: | a Department of Chemistry, University of Rome “La Sapienza”, P.le A. Moro 5, 00185 Rome, Italy
b School of Chemistry, University of Southampton, Highfield, Southampton SO17 1 BJ, UK |
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| Abstract: | The synthesis and characterization of a tetranuclear Pt complex, cis-trans-cis-trans tetraμ-2,6-diethynyl-4-nitroaniline-bis(tri(p-tolyl)phosphine) platinum(II)], namely L2Pt-DENA]4 with L = tri-p-tolylphosphine, is reported. The complex was obtained by the dehydrohalogenative condensation of 2,6-diethynyl-4-nitroaniline (DENA) with cis-dichlorobis(tri(p-tolyl)phosphine)platinum(II)]. The single crystal structure determination of L2Pt-DENA]4 indicated the formation of a neutral molecular cycle with four alternating platinum units in cis and trans configurations, all bridged with DENA spacers with the presence of solvent (toluene) crystallization molecules. A twisted tetranuclear cyclic feature was identified. The formation of intermolecular stacks of the tetranuclear complex in solution was assessed by means of nuclear Overhauser enhancement spectroscopy (NOESY) and rotating frame Overhauser effect spectroscopy (ROESY) characterizations. |
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| Keywords: | Cyclic platinum complexes X-ray 2D NMR spectra |
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