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hhf_2222

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[求助] ACTA C摘要解析

The title compound, C21H15N3O3, crystallizes in two polymorphic
forms. In the orthorhombic polymorph, (I), in space
group Fdd2 with Z = 1, the molecules lie in general positionswhile in the monoclinic polymorph, (II), in space group C2/c
with Z = 1
2, the molecules lie across twofold rotation axes. In
each polymorph, the molecules are linked by a single CÐH  
(arene) hydrogen bond, forming chains in polymorph (I) and
sheets in (II)

主要是这几句劳烦高手给解释一下:为什么前一个是Z'=1, in general positions,后一个Z'=1/2, lie across twofold rotation axes
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