Symmetrically 4,6-disubstituted 2-aminopyrimidines and 2-amino-5-nitrosopyrimidines: interplay of molecular, molecular–electronic and supramolecular structures
作者:Antonio Quesada、Antonio Marchal、Manuel Melguizo、John N. Low、Christopher Glidewell
DOI:10.1107/s0108768103024856
日期:2004.2.1
charge-assisted hydrogen bonding. The intermolecular interactions observed include hard hydrogen bonds of N-H...N and N-H...O types together with O-H...O and O-H...N types in 2-amino-4,6-bis(2-hydroxyethylamino)-5-nitrosopyrimidine; soft hydrogen bonds of the C-H...O type in both 2-amino-4,6-bis(morpholino)-5-nitrosopyrimidine (3) and 2-amino-4,6-bis(benzylamino)-5-nitrosopyrimidine (4), and of the C-H...pi(arene)
已经确定了六个对称的4,6-二取代的2-氨基嘧啶的结构,其中四个含有5-亚硝基取代基。亚硝基化合物尤其具有极化的分子电子结构,从而导致广泛的电荷辅助氢键结合。观察到的分子间相互作用包括2-氨基-4,6-双(2-羟乙基氨基)中NH ... N和NH ... O类型的硬氢键以及OH ... O和OH ... N类型-5-亚硝基嘧啶; 2-氨基-4,6-双(吗啉代)-5-亚硝基嘧啶(3)和2-氨基-4,6-双(苄基氨基)-5-亚硝基嘧啶( 4),并且在2-氨基-4,6-双(哌啶子基)嘧啶(1)和2-氨基-5-亚硝基-4,6-双(3-)中均为CH ... pi(芳烃)型吡啶基甲氧基)嘧啶(5);和氨基pi ... pi在2-氨基-5-亚硝基-4中的堆积相互作用,6-双(3-吡啶基甲氧基)嘧啶。由硬氢键形成的超分子结构是有限的,(1)中为零维,在2-氨基-4,6-双(3-吡啶基甲氧基)嘧啶(2)中为一维,在两者中均为二维(3)