Solvothermal reactions of HgI2, 4,4'-vinylenedipyridine, and HI in alcoholic solution (methanol, ethanol, or pentanol) gave rise to a family of organic-inorganic hybrid complexes, formulated as [C14H16N2][I-4](2-) (1), [C16H20N2][HgI4] (2), and [C22H32N2][HgI4](4) (3). Single-crystal X-ray diffraction reveals that all three compounds are discrete structures, including the inorganic anion [I-4](2-) or [HgI4](2-) and an organic cation, where the resulting organic cations were generated in situ alkylation reactions of 4,4'-vinylenedipyridine with alcohols, with cleavage of the alcoholic C-O bond followed by a one-step in situ N-alkylation reaction of 4,4'-vinylenedipyridine in acidic HI solution. X-ray powder diffraction (XRD), H-1 NMR and C-13 NMR, energy-dispersive X-ray (EDS), IR, as well as UV/Vis/NIR spectroscopy, elemental analysis, and thermogravimetric analysis (TGA) were used to characterize the complexes.