A Rare Example of Three Abundant Conformers in One Retro Model of the Cisplatin−DNA d(GpG) Intrastrand Cross Link. Unambiguous Evidence That Guanine O6 to Carrier Amine Ligand Hydrogen Bonding Is Not Important. Possible Effect of the Lippard Base Pair Step Adjacent to the Lesion on Carrier Ligand Hydrogen Bonding in DNA Adducts
作者:Sharon T. Sullivan、Antonella Ciccarese、Francesco P. Fanizzi、Luigi G. Marzilli
DOI:10.1021/ja010483m
日期:2001.9.1
hindering dynamic motion in Me(2)ppzPt(d(GpG)) and Me(2)ppzPt(GpG) retro models. Dynamic processes are decreased enough in Me(2)ppzPt(d(GpG)) to permit HPLC separation of three abundant forms. After HPLC separation, the three re-equilibrate, proving that the three forms must be conformers and that Me(2)ppz has little influence on conformer distribution. This marks the first reported characterization of three
and Fourier transform infrared (FTIR), ultraviolet‐visible (UV/Vis), and solution 1H, 13C, 31P, 195Pt, and 183W} nuclearmagneticresonance (NMR) spectroscopy. The characterization results indicated that a platinum(II) moiety, [cis‐Pt(Me2ppz)]2+, was coordinated to two oxygen atoms in a mono‐vacant site of [PW11O39]7– with asymmetric configuration, resulting in an overall C1 symmetry. The polyoxoanion
Synthesis and molecular structure of N-methylpiperazinium(+1) and N,N′-dimethylpiperazinium(+2) platinum(II) and platinum(IV) complexes Part II
作者:A. Ciccarese、D.A. Clemente、F.P. Fanizzi、A. Marzotto、G. Valle
DOI:10.1016/s0020-1693(98)00067-x
日期:1998.7
Square-planar Pt(II) and octahedral Pt(IV) ionic complexes [H2Me2ppz]2+ [PtCl4]2− (1), [PtCl3(H2Meppz)]2[H2Me2ppz]2+-[PtCl4]2−·2H2O (2) and [H2Me2ppz]2+[PtCl6]2− (3) have been synthesized and their molecularstructure and geometry investigated through X-ray diffraction. The N-methylpiperazinium(+1) ligand bound to Pt(II) in complex 2 and the dipositive N,N′-dimethylpiperazinium(+2) cation in complexes 1,2 and
Cisplatin−DNA Cross-Link Retro Models with a Chirality-Neutral Carrier Ligand: Evidence for the Importance of “Second-Sphere Communication”
作者:Sharon T. Sullivan、Antonella Ciccarese、Francesco P. Fanizzi、Luigi G. Marzilli
DOI:10.1021/ic000736x
日期:2001.1.1
forms) with both G H8 signals unusually downfield encouraged us to study additional Me2ppzPtG2 analogues in order to explain the unusual spectral features and to identify factors that influence the relative stability of HT and HH forms. Molecular modeling techniques suggest HH structures with the H8's close to the deshielding region of the z axis of the magnetically anisotropic Pt atom, explaining