6,7-Dihydro-5H-1,4-diazepino[1,2,3,4-lmn][1,10]phenanthroline-4,8-diium tris-(thio-cyanato-κN)cuprate(I).

The title copper(I) salt, (C(15)H(14)N(2))[Cu(NCS)(3)], exists as non-inter-acting cations and trigonal-planar anions. The cation is buckled, the r.m.s. deviation of the atoms passing through the phenanthroline portion being 0.16 Å. The Cu(I) atom is displaced by 0.019 (2) Å out of the N(3) triangle. The crystal studied was a non-merohedral twin with twin domains in an approximate ratio of 55:45.