The cocrystal nicotinamide-succinic acid (2/1).

The cocrystal nicotinamide-succinic acid (2/1).
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共晶烟酰胺-琥珀酸(2/1)。

DOI:
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发表时间:
2010
期刊:
Acta Crystallographica Section C: Crystal Structure Communications
影响因子:
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通讯作者:
M. Tremayne
M. Tremayne
中科院分区:
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文献类型:
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作者:
Laura J. Thompson;R. Voguri;A. Cowell;L. Male;M. Tremayne

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在烟酰胺-琥珀酸(2/1)2C(6)H(6)N(2)O x C(4)H(6)O(4)晶体结构的不对称单元中,两个独立的烟酰胺分子位于一般位置,两个半琥珀酸分子位于反转中心附近。该结构包含酸-吡啶和酰胺-酰胺合成子,烟酰胺分子形成交替的R(2)(2)(8)和R(4)(2)(8)环的阶梯,通过琥珀酸连接,形成波纹状的氢键片。这种薄片是在其他2:1烟酰胺-二羧酸共晶体中发现的常见超分子单元,但两种具有反和顺构象的晶体学上不同的烟酰胺的存在,在相同的结构中形成两种不同的薄片,是这类材料的一种新颖的填充特征。
In the asymmetric unit of the crystal structure of nicotinamide-succinic acid (2/1), 2C(6)H(6)N(2)O x C(4)H(6)O(4), there are two independent nicotinamide molecules in general positions and two half succinic acid molecules which lie about inversion centres. The structure contains acid-pyridine and amide-amide synthons with nicotinamide molecules forming ladders of alternating R(2)(2)(8) and R(4)(2)(8) rings linked through succinic acid to generate a corrugated hydrogen-bonded sheet. This sheet is a common supramolecular unit found in other 2:1 nicotinamide-dicarboxylic acid cocrystals, but the presence of two crystallographically distinct nicotinamides with anti and syn conformations, forming two distinct sheets within the same structure, is a novel packing feature in this type of material.