The crystal and molecular structures of three metal complexes of the pyrimidine derivative, 1-(2-hydroxyethyl)-(2-aminoethyl-N2)-5-methylisocytosine reveal that, as a ligand, this heterocyclic base exhibited a diverse range of co-ordination modes. With zinc(II), monodentate co-ordination via the carbonyl oxygen of the pyrimidine base was observed. In the case of palladium(II), both a didentate mode, via endo- and exo-cyclic nitrogen donors, and a tridentate mode, involving exocyclic nitrogens and the alcohol oxygen donors, was observed. In the latter case the pyrimidine exists in the rare iminooxo tautomeric form.
嘧啶衍
生物 1-(2-羟乙基)-(2-
氨乙基-N2)-5-甲基异
胞嘧啶的三种
金属配合物的晶体和分子结构显示,作为
配体,这种杂环碱具有多种配位模式。
锌(II)通过
嘧啶碱的羰基氧进行单配位。对于
钯(II),则观察到通过内环和外环氮供体的二齿配位模式,以及涉及外环氮和醇氧供体的三齿配位模式。在后一种情况下,
嘧啶以罕见的亚
氨基氧同分异构形式存在。