Role of π-interactions in solid state structures of a few 1,8-naphthalimide derivatives

Synthesis, spectral, and magnetic studies of benzothiazolium tetrachlorocuprate salts: crystal structure and semiconducting behavior of bis[2-(4-methoxyphenyl)benzothiazolium] tetrachlorocuprate(II)

“…These organic chains, oriented antiparallel, instead of parallel stacking [40], along the b-cell direction as ABAB layers, undergo face-to-face stacked orientation [12,44,45] with a mpbH + centroid-centroid distance of 3.784 Å, which is less than the van der Waal radii of 3.8 Å, forming a supramolecular 3-D structure [figure 5(c)]. Thus, the compound possesses layer structure, with organic cation layers made up of substituted 2-phenyl benzothiazolium and anion layers constituting CuCl 2À 4 , where the anion units are not interconnected by bridging chlorides, Cl⋯Cl, but in some cases, their interconnection leads to unique properties [13,15].…”

Variations in product in reactions of naphthoquinone with primary amines

“…The incorporation of pyridine ring to a quinone has also another facet as we have recently observed that in picolyl derivative of 1,8-naphthalimides the π-π interactions are governed by the position of the nitrogen in the pyridine ring. [23] Thus, we prepared two picolyl derivatives of 1,4-naphthoquinone from independent reactions of 3-picolylamine and 4-picolylamine with 1,4-naphthoquinone. These reactions resulted in the corresponding 2-amino substituted 1,4-naphthoquinones as illustrated in Scheme 3.…”

Polyamines. IV. Spectroscopic properties of N,N-bis-(1,8-naphthalenedicarboximidopropyl)-N-propylamine and supramolecular interactions in its crystals

“…The NDCI unit is known as a p-electron-deficient ring system and it has been established that intermolecular interactions between p-deficient and p-deficient functionalities are the most favorable [23], thus forming pÁ Á Áp stacking in the supramolecular structures and the NDCI unit has been recognized as a supramolecular synthon [24][25][26][27][28][29]. Admittedly, hydrogen bonding is a wider used tool in crystal engineering because its directionality and robustness enable facile and reliable transfer from one system to the other.…”

“…Admittedly, hydrogen bonding is a wider used tool in crystal engineering because its directionality and robustness enable facile and reliable transfer from one system to the other. In contrast, pÁ Á Áp stacking is less predictable due to the fact that in the solid state variable orientations of the moieties involved often occur in order to maximize the electrostatic attraction between the r framework and the p electron density of the stacked groups [23,25,29].…”

“…Supramolecular structures of N-(3-picolyl)-, N-(4-picolyl)-or N,N-(benzyl)-derivatives of 1,8-naphthalimide are good examples [29]. The pÁ Á Áp stacking of 1,8-naphthalimide units with a head-to-tail disposition of the dipole vectors is maintained in the structures of rhenium complexes with bidentate bis-(pyrazolyl)-methane ligands [24].…”