Sheikh Tasneem Ullah, Khan Misbahul Ain, Arshad Muhammad Nadeem, Khan Islam Ullah, Stoeckli-Evans Helen
Acta Crystallogr Sect E Struct Rep Online. 2009 Jan 17;65(Pt 2):o330. doi: 10.1107/S1600536809001470.
The title compound, C(12)H(12)N(2)O(2), crystallized in the monolinic space group P2(1)/n, with two independent mol-ecules (A and B) in the asymmetric unit. This is in contrast to the first monoclinic polymorph reported [Cingolani et al. (2002 ▶). Inorg. Chem.41, 1151-116], which crystallized in the space group C2/c with one independent mol-ecule per asymmetric unit. The dihedral angles between the two rings differ slightly; in mol-ecule A it is 4.90 (11)° and in mol-ecule B it is 16.05 (13)°. In both mol-ecules, there is an intra-molecular O-H⋯O hydrogen bond involving the hydroxyl substituent and the carbonyl O atom of the adjacent acetyl group. In the crystal structure, mol-ecules A and B are linked via a C-H⋯N inter-action. There are also some weak C-H⋯π inter-actions involving the phenyl ring of mol-ecule A and H atoms of the acetyl groups of both mol-ecules.
标题化合物C(12)H(12)N(2)O(2)结晶于单斜空间群P2(1)/n中，不对称单元中有两个独立分子（A和B）。这与首次报道的单斜多晶型物[Cingolani等人（2002 ▶）。《无机化学》41, 1151 - 116]不同，后者结晶于空间群C2/c中，每个不对称单元中有一个独立分子。两个环之间的二面角略有不同；在分子A中为4.90 (11)°，在分子B中为16.05 (13)°。在两个分子中，均存在一个分子内O - H⋯O氢键，涉及羟基取代基和相邻乙酰基的羰基O原子。在晶体结构中，分子A和B通过C - H⋯N相互作用相连。还存在一些涉及分子A的苯环和两个分子乙酰基的H原子的弱C - H⋯π相互作用。
