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The title compound, C 16 H 20 N 2  2+ ·2Br - ·H 2 O ( 1 ) is a member of the class of compounds called viologens. Viologens are quaternary salts of di-pyridyls and are especially useful as redox indicators as a result of their large negative one-electron reduction potentials. Compound 1 consists of a dication composed of a pair of 4-methyl-pyridine rings mutually joined at the 2-position, with a dihedral angle between the pyridine rings of 62.35 (4)°. In addition, the rings are tethered via the pyridine nitro-gen atoms by a tetra-methyl-ene bridge. Charge balance is provided by a pair of bromide anions, which are hydrogen bonded to a single water mol-ecule [ D  O⋯Br = 3.3670 (15) and 3.3856 (15) Å]. The crystal structure of 1 , details of an improved synthesis, and a full analysis of its NMR spectra are presented.

4,15-Dimethyl-7,12-diazoniatricyclo[10.4.0.02,7]hexadeca-1(12),2,4,6,13,15-hexaene dibromide monohydrate

4,15-Dimethyl-7,12-diazoniatricyclo[10.4.0.0^2,7]hexadeca-1(12),2,4,6,13,15-hexaene dibromide monohydrate