APPLICATION OF SYMBOLIC ADDITION METHOD TO STRUCTURE OF L-ARGININE DIHYDRATE
APPLICATION OF SYMBOLIC ADDITION METHOD TO STRUCTURE OF L-ARGININE DIHYDRATE
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DOI：
10.1107/s0365110x64002250
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发表时间：
1964-01-01
期刊：
影响因子：
--
通讯作者：
KARLE, J
中科院分区：
文献类型：
--
作者：
KARLE, IL;KARLE, J
利用铜辐射获得的完整三维数据，用符号加成定相方法直接测定了L-精氨酸二水合物的晶体结构。空间群为P212~21，晶胞尺寸为：a--5.68，b=11.87，c=15.74A。精氨酸分子是一个带有胍基的两性离子，而不是氨基，接受一个额外的质子。精氨酸分子有两个平面，一个通过酸性基团，另一个通过含有胍基的延伸侧链。这两个平面之间的二面角是74。精氨酸分子和水分子都通过氢键形成相互垂直的无限链。所有18个氢原子都已被定位。
The crystal structure of L-arginine dihydrate was determined directly by means of the symbolic addition phase determination procedure, using the complete three-dimensional data obtained from Cu radiation. The space group is P212~ 21 and the cell dimensions are: a--5.68, b= 11.87, and c= 15.74 A.The arginine molecule is a zwitterion with the guanidyl group, rather than the amino group, accepting an extra proton. Two planes characterize the arginine molecule, one through the acid group, and the other through the extended side chain which contains the guanidyl group. The dihedral angle between these planes is 74. The arginine molecules and the water molecules each make infinite chains perpendicular to each other by hydrogen bonding. All 18 hydrogen atoms have been located.