stacking interaction between one of the PPh3 phenyl groups and the pyrimydinic N3-platinated cytosine or the imidazole part of the N7-coordinated guanine base. The addition of a further equiv of nucleobase to the monoadducts forms quantitatively the bisadducts that have been isolated as pure compounds 4a and 5a. Under the same experimental conditions, the dinitrato analogue cis-[(PMePh2)2Pt(ONO2)2]
将1-甲基
胞嘧啶(1-MeCy)或9-甲基
鸟嘌呤(9-MeGu)以1:1的摩尔比添加到顺式(PPh3)2P(ONO2)2(1a)的溶液中,得到一加合物顺式-[((PPh3)2Pt(1-MeCy)(ONO2)]
NO3(2a)和顺式-[(PPh3)2Pt(9-MeGu)(ONO2)] (3a)和仅少量的双加合物顺式-[ (PPh3)2Pt(1-MeCy)2]( )2(4a)和cis-[(PPh3)2Pt(9-MeGu)2]( )2(5a)。对2a和3a的X射线结构测定表明PPh3苯基之一与N7配位的
鸟嘌呤碱基的
嘧啶N3镀的
胞嘧啶或
咪唑部分之间有很强的pi-pi堆积相互作用。在单加合物中添加另外等价的核苷碱基定量地形成了已被分离为纯化合物4a和5a的双加合物。在相同的实验条件下 dinitrato类似物顺式[[(PMePh2)2Pt(ONO2)2](1b)形成单加合物2b和3b,