Sehimi Hiba, Chérif Ichraf, Zid Mohamed Faouzi
Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Manar II Tunis, Tunisia; Université de Gabès, Faculté des Sciences de Gabès, Campus Universitaire, Cité Erriadh Zrig, Gabès, 6072, Tunisia.
Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences de Tunis, Université de Tunis El Manar, 2092 Manar II Tunis, Tunisia.
Acta Crystallogr E Crystallogr Commun. 2016 Jun 21;72(Pt 7):1002-5. doi: 10.1107/S2056989016009695. eCollection 2016 Jul 1.
The title organic-inorganic hybrid salt, (C7H11N2)2[V(C2O4)2O(H2O)]·2H2O, shows a distorted octa-hedral coordination environment for the vanadium(IV) atom in the anion (point group symmetry 2), with four O atoms from two symmetry-related chelating oxalate dianions and two O atoms in trans configuration from a coordinating water mol-ecule and a terminal vanadyl O atom. In the crystal, (001) layers of cations and anions alternate along [001]. The anionic layers are built up by inter-molecular O-H⋯O hydrogen bonds involving the coordinating and solvent water mol-ecules. The cationic layers are linked to the anionic layers via N-H⋯O hydrogen bonds between the pyridinium group and the non-coordinating O atoms of the oxalate group. The 4-(di-methyl-amino)-pyridinium cations are also engaged in π-π stacking with their anti-parallel neighbours [centroid-to-centroid distance = 3.686 (2) Å]. Considering all supra-molecular features, a three-dimensional network structure is accomplished.
标题有机-无机杂化盐(C₇H₁₁N₂)₂[V(C₂O₄)₂O(H₂O)]·2H₂O中，阴离子中钒(IV)原子呈现扭曲的八面体配位环境（点群对称性2），其中四个氧原子来自两个对称相关的螯合草酸根二价阴离子，另外两个氧原子呈反式构型，分别来自一个配位水分子和一个末端钒氧基氧原子。在晶体中，阳离子和阴离子的(001)层沿[001]交替排列。阴离子层通过涉及配位水分子和溶剂水分子的分子间O—H⋯O氢键形成。阳离子层通过吡啶鎓基团与草酸根基团的非配位氧原子之间的N—H⋯O氢键与阴离子层相连。4-(二甲基氨基)吡啶鎓阳离子还与其反平行相邻分子发生π-π堆积[质心到质心距离 = 3.686 (2) Å]。考虑到所有超分子特征，形成了三维网络结构。
