Hydrogen bonded supramolecular network in a simple organic–inorganic salt: hydrophilic gallery formed between two hydrophobic layers in the crystal structure of [C₆H₉N₂]ClO₄·H₂O

Inverse bilayer structure of mononuclear CoII and NiII complexes of the type M(H2O)3(SO4)(4-CNpy)2

“…It will be seen that both compounds discussed here have a novel two-dimensional structure, closely akin to clay mimics (Holman et al, 2001;Beatty et al, 2002;Biradha et al, 1998). It is also noted that the crystal structures described herein resemble the 'inverse bilayer' structure identified previously (Raghavaiah et al, 2005;Janiak, 2006). What is unique about the present results is that unlike in earlier cases where salts of organic cations have been shown to organize into bilayers consisting of hydrophilic interior regions and hydrophobic exterior regions, the bilayer formation in (1) and (2) involves monohydrated metal complexes which are charge-neutral.…”

Hydrophilic interior between hydrophobic regions in inverse bilayer structures of cation–1,1′-binaphthalene-2,2′-diyl phosphate salts

“…The use of supramolecular interactions to mimic such a natural organization process in molecular crystals is a challenge in crystal engineering. 2,3 In this respect, we have synthesized and structurally characterized salts 1-6 of the 1,1 0binaphthalene-2,2 0 -diyl phosphate (BNPPA) anion, which has a polar phosphate group and a non-polar binaphthalene-diyl moiety (Scheme 2). The phosphate group is an excellent acceptor of classical O/N-HÁ Á ÁO hydrogen bonds, 2,4 whereas the naphthyl group can interact through pÁ Á Áp stacking 5,6 and C-HÁ Á Áp bonding.…”

Benzene-1,2-diaminium bis(4-methylbenzene-1-sulfonate)

“…The aromatic diamine, benzene-1,2-diamine also known as o-phenylenediamine, can function as a neutral ligand and bind to a metal via both amine N atoms (Koizumi & Fukuju, 2011;Guillé n et al, 2018) or by a single nitrogen in a monodentate fashion (Nelson et al, 1982;Dickman, 2000). In addition, benzene-1,2-diamine can function as a charge-balancing dication in which both the amine N atoms are protonated (Raghavaiah et al, 2006;Powers & Geiger, 2019) or as a monocation (Raghavaiah et al, 2005;Mishra & Pallepogu, 2018). The structural diversity of the compounds of benzene-1,2-diamine in neutral or cationic form is highlighted by the results of a survey of the Cambridge Structural Database (CSD; Groom et al, 2016), which had more than 220 hits for the above three types of compounds.…”