deprotonation up to pH > 12. In the presence of metal(II) ions they undergo concomitant deprotonation and complexation to form [M(L-2H)] compounds. Formation constants have been determined for Cu(II), Ni(II), and Zn(II) complexes of the suite of ligands. Determined values for the two observed steps of log β ML-2H and log β ML-3H (where additional alcohol or coordinated water deprotonation occurs) are
2,6-双(甲氧基羰基)
吡啶与两当量的β-
氨基醇反应生成
吡啶-2,6-二酰胺
C6H3N(CONH–CR1R2–CHR3–OH)2 [(1) R1 = R2 = R3 = H ; (2) R1 = R2 = H,R3 =
CH3;(3) R1 = ,R2 = R3 = H;(4) R1 =
C2H5,R2 = R3 = H;(5) R1 = C6H5CH2,R2 = R3 = H;(6) R1 = O2NC6H4CH(OH),R2 = R3 = H;(7) R1 = R2 = , R3=H] 结合了
氨基醇,其中一些是手性的,而游离二酰胺
配体在 pH > 12 时没有表现出去质子化的能力。在
金属 (II) 离子的存在下,它们伴随去质子化和络合形成 [M(
L-2H)] 化合物。已确定
配体套件的 Cu(II)、Ni(II) 和 Zn(II) 配合物的形成常数。log β M
L-2H 和