Cocrystals of U-shaped ureadicarboxylic acid with 2-aminopyrimidine and melamine: rhombus-shaped cyclic heterotetramer motifs

TETRAHEDRON LETTERS

卷:53

Article

Hisamatsu, Shugo¹  Masu, Hyuma²  Takahashi, Masahiro¹  Kishikawa, Keiki¹  Kohmoto, Shigeo¹ 

[1] Chiba Univ, Grad Sch Engn, Dept Appl Chem & Biotechnol, Inage Ku, Chiba 2638522, Japan

[2] Chiba Univ, Ctr Chem Anal, Inage Ku, Chiba 2638522, Japan

关键词: Crystal structure;    Cocrystal;    Urea;    Hydrogen bonding;   

DOI  :  10.1016/j.tetlet.2012.05.065

来源: Elsevier

【 摘 要 】

Single crystal X-ray structures of cocrystals, 1.2 and 1.3, derived from U-shaped ureadicarboxylic acid (1) with 2-aminopyrimidine (2) and melamine (3), respectively, were examined. Cocrystals were obtained as a 1:1 mixture of 1 and the corresponding base. Two molecules of 1 and two molecules of the base were combined together via intermolecular H-bonding creating a supramolecularly assembled cyclic heterotetramer motif of rhombus shape. In the case of cocrystal 1.3, the cyclic heterotetramers were connected via H-bonding by utilizing a remaining amino group of melamine resulting in the formation of a tape of cyclic heterotetramer. (C) 2012 Elsevier Ltd. All rights reserved.

【 授权许可】

Free