1. Affinity of Divalent Mercury Towards Nitrogen Donor Ligands
2. Strong Attraction of Caffeine to the Mercurous Dumbbell in the Salt [Hg2(Caf)2](ClO4)2(H2O)2
3. HgCl2(Caf): Colourless single crystal. diffractometer IPDS I, STOE, Darmstadt. Mo-Kα radiation, graphite monochromator, λ = 71.07 pm. T = 293(2) K. monoclinic, P21, Z = 2, a = 398.36(8), b = 1964.5(4), c = 809.6(2) pm, ß = 99.24(3)°, V = 625.3(2)·106 pm3. F(000) = 412, μ = 12.726 mm-1. θmin = 2.6°, θmax = 27°, −4