Complexes of d and f Metals with 2-Methyl-3-hydroxy(amino)pyrido[1,2-a]pyrimidine-4-one.Crystal Structure of 2-Methyl-3-hydroxypyrido[1,2-a]pyrimidine-4-one

摘要

Six complexes of scandium(III),lanthanum(III),praseodymium(III),and copper(II) chlorides with 2-methyl-3-hydroxypyrido[1,2-a]pyrimidine-4-one (HL~1) and 2-methyl-3-aminopyrido[1,2-a]pyrimidine-4-one (L~2),as well as hydrochloride and hydronitrate L~2,were isolated.The crystal and molecular structures of HL~1 were determined.HL~1 in CCl_4 solution was shown (IR data) to occur as two forms,namely,neutral and zwitterionic forms.The structures for the complexes isolated were proposed.