Hydrate frameworks involving the pyridazino[4,5-d] pyridazine unit as a multiple hydrogen-bond acceptor

被引:2
|
作者
Zhylenko, Iryna S. [1 ]
Solntsev, Pavlo V. [1 ]
Rusanov, Eduard B. [2 ]
Chernega, Alexander N. [2 ]
Domasevitch, Konstantin V. [1 ]
机构
[1] Kiev Univ, Dept Inorgan Chem, UA-01033 Kiev, Ukraine
[2] Inst Organ Chem, UA-02094 Kiev, Ukraine
来源
ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY | 2008年 / 64卷 / o237-o241期
关键词
D O I
10.1107/S0108270108007117
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
1,4,5,8-Tetramethylpyridazino[4,5- d] pyridazine trihydrate, C10H12N4 center dot 3H(2)O, ( I), and 1,2,3,6,7,8-hexahydrocinnolino-[5,4,3-cde] cinnoline tetrahydrate, C12H12N4 center dot 4H(2)O, (II), exhibit exceptional functionality of the condensed N-4-heteroaromatic frame as a symmetric acceptor of four hydrogen bonds [N center dot center dot center dot O = 2.843 ( 2) - 2.8716 ( 10) angstrom]. Thus, all the N atoms of the electron-deficient and highly pi-acidic polynitrogen heterocycles function as lone-pair donors. In ( I), all the molecular components lie on or across special positions; the site symmetry is 2/m for the organic and m2m and m for the two water molecules. In ( II), the organic polycycle lies across a crystallographic inversion center. Both structures involve a hydrogen-bonded centrosymmetric water - pyridazine dimer as the basic supramolecular unit, which is integrated into two-dimensional [ in ( I)] and three-dimensional [in (II)] hydrate frameworks by hydrogen bonding with the additional water molecules [O center dot center dot center dot O = 2.744 ( 2) - 2.8827 ( 19) angstrom]. The hydrate connectivity exists in the form of an ( H2O)(3) trimer in ( I) and as a one-dimensional zigzag (H2O)(n) chain in ( II).
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页码:O237 / O241
页数:5
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