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The title compound, C22H24N2O2, crystallizes in space group P21/n. The molecular structure is almost planar except for a tilt of the phenyl rings. The allyl groups on both ends exhibit the trans-form and the connected N atoms show sp2 character. The molecules are stacked and assembled along the c-axis direction by C—H...π interactions.

In the title salt solvate (systematic name: 8-amino-5-ethyl-6-phenylphenanthridin-5-ium benzoate methanol monosolvate), C21H20N3+·C6H5CO2−·CH3OH, two ethidium cations, C21H20N3+, dimerize about a twofold axis through π–π interactions [inter-centroid separation = 3.6137 (4) Å]. The benzoate anions are connected through hydrogen bonding with the –NH2 groups of the ethidium cations and the –OH group of the MeOH molecule. The MeOH molecule also accepts a hydrogen bond from the –NH2 group of the ethidium cation. The result is a one-dimensional hydrogen-bonded chain along the b-axis direction.

In the title solvated salt, (C21H20N3){B(C6H5)4}·2CH3CN (systematic name 3,8-diamino-5-ethyl-6-phenylphenanthridin-5-ium tetraphenylborate acetonitrile disolvate), the dihedral angle between the tricyclic fused ring system (r.m.s. deviation = 0.021 Å) and the pendant phenyl group of the ethidium cation is 84.91 (7)°. The {B(C6H5)4}− anion has a typical tetrahedral structure. The acetonitrile solvent molecules do not accept hydrogen bonds from the –NH2 groups of the ethidium ions.

In the title compound (systematic name: 3,8-diamino-5-ethyl-6-phenylphenanthridin-5-ium 2,2,3,3,4,4,4-heptafluorobutyrate), C21H20N3+·C4F7O2−, two ethidium ions, C21H20N3+ form a dimerized structure due to π–π interactions, even though they are positively charged. The heptafluorobutyrate anions are connected to neighbouring cation dimers via hydrogen-bonding interactions, the hydrogen-bonding donor sites of the –NH2 groups of the ethidium ions connecting to the hydrogen-bonding acceptor sites of the –COO− groups of the heptafluorobutyrate anions.

In the title coordination polymer, {(C4H14N2)[Mn2(C2O4)3]·6H2O}n, the MnII ions are octahedrally coordinated by the oxalate ligands to form a two-dimensional honeycomb-like network. This anionic framework incorporates the centrosymmetric butane-1,4-diammonium ions as counter-cations. The two-dimensional network is slightly distorted as a result of the vertically incorporated cations. Three kinds of water molecules are located in an interlayer space, forming hydrogen bonds with the ammonium cations and the oxalate ligands of the framework.

In the title coordination polymer, [Zn2(C6H10N3)3(NO3)]n, two independent ZnII ions are tetrahedrally coordinated by the anionic ligands, viz. 2-[(dimethylamino)methyl]imidazolate or nitrate ions. One ZnII ion is coordinated by the imidazolate N atoms of three anions and an O atom of the nitrate ion. The second ZnII ion is coordinated by imidazolate N atoms of three anions and one amino N atom of one such ligand. The 2-[(dimethylamino)methyl]imidazolate anions are bridging the ZnII ions to form a helical chain structure along [001]. The chains are further linked by the bridging ligands into a three-dimensional framework structure. The nitrate anion is disordered over two sets of sites and was refined with two pairs of three O atoms using half-occupancy for each O atom.