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3,4-次甲二氧苯甲酰哌啶单晶属单斜晶系,空间群C2k5-P21/c,晶胞参数α=10.381(2)?,b=7.163(2)?,c=16.951(3)?,β=107.51(5)°,晶胞内分子数z=4。用PW-1100四圆衍射仪收集衍射强度数据,独立衍射点2176个。以直接法(MULTAN-74)测定分子结构。结构参数的修正采用准对角矩阵最小二乘法,R=0.072(2176个衍射点)。由差值图获得全部氢原子位置。分子间以范德瓦耳斯力联系。3, 4-METHYLBNEDIOXY-BENZOYL PICOLINE crystal belongs to mono-clinic system. The space group is C2k5-P21/c with four formula units in a cell of dimension a = 10.381(2)?, b = 7.163(2)?, c = 16.951(3)?, β = 107.51 (5)°. The structure was solved by direct method (MULTAN-74). Eefinement of structure parameters was acheived by BLOCK-matrix least-squares method, R = 0.072 (for 2176 observed reflexions) .The intensity data were collected on PW-1100 four-circle diffractometer.All of the hydrogen atoms were located in the difference Fourier maps. The molecules are bound by the van der waals' force.
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