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ACTA CÕªÒª½âÎö
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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) Ö÷ÒªÊÇÕ⼸¾äÀÍ·³¸ßÊÖ¸ø½âÊÍһϣºÎªÊ²Ã´Ç°Ò»¸öÊÇZ'=1, in general positions£¬ºóÒ»¸öZ'=1/2, lie across twofold rotation axes |
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