K. Biradha et al., Covalent and noncovalent interpenetrating planar networks in the crystal structure of {[Ni(4,4 '-bipyridine)(2)(NO3)(2)center dot 2pyrene}(n), CHEM COMMUN, (14), 1999, pp. 1327-1328
The crystal structure of {[Ni(4,4'-bipyridine)(2)(NO3)(2)]. 2pyrene}(n) rev
eals the first example of complementary, interpenetrating covalent and nonc
ovalent 2D networks.