In the title compound, C24H25ClN2, the methine, methyl­ene and methyl C atoms of the methyl-substituted imidazolidine ring are disordered over two sets of sites with a refined occupancy ratio of 0.834 (4):0.166 (4). Each disordered ring assumes an envelope conformation with an N atom as the flap. The pendant benzyl rings are oriented equatorially with respect to the imidazolidine ring. The chloro­phenyl ring is inclined to the mean plane of the four planar atoms of the major component of the imidazolidine ring by 76.27 (12)°. The dihedral angles between the chloro­phenyl ring and the two benzyl rings are 55.31 (9) and 57.50 (8)°; the dihedral angle between these latter rings is 71.59 (9)°. In the crystal, mol­ecules are linked by C—H⋯Cl inter­actions and a number of weak C—H⋯π inter­actions, involving all three aromatic rings, forming a three-dimensional structure.

The title chiral quaternary ammonium salt, C13H25N4 +·I−, was synthesized through the Menschutkin reaction between the cage aminal (2S,7S)-1,8,10,12-tetra­aza­tetra­cyclo­[8.3.1.18,12.02,7]penta­decane and ethyl iodide. The quaternization occurred regioselectively on the nitrogen with major sp3 character. The crystal structure consists of anions and cations separated by normal distances. Ions are not linked through C—H⋯I hydrogen bonds.

The centrosymmetric dinuclear cadmium title complex, [Cd2(C6H18N4)3](ClO4)4, was obtained by the reaction of N,N′-bis­(2-amino­eth­yl)ethane-1,2-diamine (trien) with Cd(NO3)2·4H2O and sodium perchlorate in methanol. The CdII cation is coordinated by four N atoms of a non-bridging trien ligand and by two N atoms of a bridging trien ligand in a slightly distorted octa­hedral coordination geometry. The bridging ligand shares another two N atoms with a neighboring symmetry-equivalent CdII cation. The structure displays C—H⋯O and N—H⋯O hydrogen bonding. The perchlorate anion is disordered over two sets of sites in a 0.854 (7): 0.146 (7) ratio.

The title complex, [Cd(C6H17N3)2](ClO4)(NO3), was synthesized by the reaction of Cd(NO3)2·4H2O, bis­(3-amino­prop­yl)­amine and sodium perchlorate in methanol. The asymmetric unit of the title complex consists of one Cd2+ cation, two tridentate bis­(3-amino­prop­yl)amine ligands, one nitrate anion and one perchlorate anion. The Cd2+ cation is coordinated by six N atoms of the bis­(3-amino­prop­yl)amine ligands in a slightly distorted octa­hedral coordination geometry. In the crystal, mol­ecules are held together by an intricate network of N—H⋯O inter­actions. One of the two amine ligands was found to be disordered over two sets of sites, with a ratio of 0.802 (3):0.198 (3), similarly to the nitrate anion, with a ratio of 0.762 (10):0.238 (10).

In the title compound, C42H46N2O4, both crystallographically independent mol­ecules display a 1,3-alternate conformation. Their crystal packing is stabilized by non-classical C—H⋯N hydrogen bonds. The dihedral angles between the planes of the aromatic rings and the mean plane through the methyl­ene C atoms bridging the aromatic rings are 78.10 (13), 80.74 (14), 81.89 (12) and 79.05 (14)° for the first mol­ecule, and 71.65 (11), 76.60 (13), 77.97 (14) and 74.76 (13)° for the second mol­ecule. Both mol­ecules have three C atoms of one prop­oxy chain disordered over two set of sites; the site-occupancy factors are 0.7/0.3 and 0.6/0.4, respectively.

The title compound, C15H18N4O3, was formed by the reaction of methanol with 5-ethyl-1,3-dimethyl­alloxazinium perchlorate. Its structure mimics those of possible flavin inter­mediates in flavoenzymes. The heterocyclic rings are substituted with methyl, ethyl and meth­oxy groups. The central tricyclic skeleton is bent due to the presence of an sp 3 C atom. There are weak inter­molecular C—H⋯O inter­actions in the structure, forming a three-dimensional network.