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4- and 5-nitro-2-benzoylbenzoic acid

机译:4-和5-硝基-2-苯甲酰基苯甲酸

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The structures of two isomeric nitro 2-benzoylbenzoic acids have been determined. 4-Nitro-2-benzoylbenzoic acid, C14H9NO5, monoclinic, P2(1)/c, a = 9.455(5), b = 6.632(2), c = 21.333(7)Angstrom, beta = 107.96(3)degrees Z = 4, V = 1270.6(9)Angstrom(3), 5-nitro-2-benzoylbenzoic acid, C14H9NO5, monoclinic, P2(1)/c, a = 10.201(6), b = 8.515(4), c = 14.573(7)Angstrom, beta = 101.35(4)degrees Z = 4, V = 1241.1(11)Angstrom(3). Both carboxylic acids form the usual H-bonded dimers across crystallographic centers of inversion. The nitro groups are essentially in the ring planes, and the interplanar angle between the mean planes described by the atoms of the benzoyl substituents and those of the benzoic acid aryl rings are 69(1)degrees and 84(1)degrees, respectively. The lower cell volume, higher density, and lower solubility in ethyl ethanoate correlates with the greater packing efficiency in 5-nitro-2-benzoylbenzoic acid. [References: 12]
机译:已经确定了两种异构的硝基2-苯甲酰基苯甲酸的结构。 4-硝基-2-苯甲酰基苯甲酸,C14H9NO5,单斜晶系,P2(1)/ c,a = 9.455(5),b = 6.632(2),c = 21.333(7)埃,β= 107.96(3) = 4,V = 1270.6(9)埃(3),5-硝基-2-苯甲酰基苯甲酸,C14H9NO5,单斜晶系,P2(1)/ c,a = 10.201(6),b = 8.515(4),c = 14.573(7)埃,β= 101.35(4)度Z = 4,V = 1241.1(11)埃(3)。两种羧酸在反演的晶体学中心形成通常的氢键二聚体。硝基基本上在环平面上,并且由苯甲酰基取代基的原子描述的平均平面与苯甲酸芳基环的原子描述的平均平面之间的平面角分别为69(1)度和84(1)度。较低的细胞体积,较高的密度和较低的在乙醇酸乙酯中的溶解度与在5-硝基-2-苯甲酰基苯甲酸中的较高填充效率相关。 [参考:12]

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