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The Crystal and Molecular Structure of 6-Ethyl-5,6-Dihydrouracil
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¾ÈÁßÅ ( Ahn Choong-Tai ) - Çѱ¹¿Ü±¹¾î´ëÇб³ ÀÚ¿¬°úÇдëÇÐ ÈÇаú
KMID : 1059519960400030161
Abstract
6-ethyl-5,6-dihydrouracil(C6H10N2O2)Àº ´Ü»çÁ¤°èÀÎ °ø°£±º P21/cÀ¸·Î a=10.302(2), b=10.419(3), c=7.095(1)¡Ê, ¥â=106.6(0), Z=4, V=729.7(3)¡Ê3, Dc=1.29 g/cm3, ¥ë(Mo K¥á)=0.71073¡Ê, ¥ì=0.010 cm-1, F(000)=304À̸ç, F > 4.0 ¥ò(F)ÀÎ 1070°³ÀÇ °üÃøµÈ ȸÀýÁ¡¿¡ ´ëÇÑ R°ªÀº 0.054 ¿´´Ù. Á÷Á¢¹ý¿¡ ÀÇÇÏ¿© ±¸Á¶¸¦ Ç®¾úÀ¸¸ç, ÀüÇà¿-ÃÖ¼ÒÀڽ¹ý¿¡ ÀÇÇÏ¿© Á¤¹ÐÈÇÏ¿´°í, C-H °áÇÕ±æÀÌ´Â 0.96¡Ê¿¡ °íÁ¤ÇÏ¿´´Ù. Hydrouracil °í¸®´Â ºÒ±ÔÄ¢ÇÑ puckered °¢À» °¡Áø envelope conformationÀ¸·Î µÇ¾î ÀÖ°í, °í¸®¿¡ ºÙ¾î ÀÖ´Â ¿¡Æ¿±â´Â axial ¹æÇâÀ¸·Î ÇâÇϰí ÀÖÀ¸¸ç, ´ÜÀ§ °ÝÀÚ¼Ó¿¡´Â 100Æò¸é¿¡ °ÅÀÇ ÆòÇàÀÎ 2Â÷¿øÀÇ °áÇÕ¸ÁÀ» ÀÌ·é, µÎ°³ÀÇ ºÐÀÚ°£ ¼ö¼Ò°áÇÕ, N(1)-H---O(7)(1+x, 0.5-y, -0.5+z)¿Í N(3)-H---O(7)(1+x, 0.5-y, 0.5+z)°¡ ÀÖÀ¸¸ç, ÀÌ¿ô ºÐÀÚ¿ÍÀÇ ÃÖ´Ü °Å¸®´Â C(4)---O(8)(-x, -y, 1-z)ÀÇ 3.187¡ÊÀÌ´Ù.
6-ethyl-5,6-dihydrouracil(C6H10N2O2) is monoclinic, space group P21/c with a=10.302(2), b=10.419(3), c=7.095(1)¡Ê, ¥â=106.6(0), Z=4, V=729.7(3)¡Ê3, Dc=1.29 g/cm3, ¥ë(Mo K¥á)=0.71073¡Ê, ¥ì=0.010 cm-1, F(000)=304, and R=0.054 for 1070 unique observed reflection with F > 4.0 ¥ò(F). The structure was solved by direct methods and refined by full-matrix least-squares refinement with the fixed C-H bond length at 0.96¡Ê. The hydrouracil molecule makes an envelope conformation with the ethyl substituent oriented to an axial position attainable to a varying degree of steric strain. There are two intermolecular hydrogen-bondings via N-H---O interactions, being nearly parallel to the 100 plane. The shortest distance between molecules is 3.187¡Ê of C(4) and O(8) (-x, -y, 1-z).
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