N-[ferrocenylmethyl]dimethylammonium and halometallates were obtained in ethanolic media. From an infrared study, the suggested structures are monomeric or dimeric for tin compounds which contain [SnCl4(OH)2]2-, [(SnCl5)]- and [(SnI5)]-, [SnCl3(OH)2]- and [(SnI6)]2- complex anions, interacting through hydrogen bonds with the cation, the environments around tin (IV) centers being trigonal bipyramidal or octahedral. For hydrated Cu(II) and Cd(II) adducts, we proposed dimeric structures with hydrogen bridges between cation and water H2O, the environments around Cu(II) being trigonal and trigonal bipyramidal, respective octahedral around Cd(II). One of the compounds may contain the hydrogeno bis [N-ferrocenylmethyldimethylamine] captive cation with a hydrogen bond (N-H….N), the cation interacting electrostatically with [ZnBr4]2-. The crucial role of the cation in all the compounds is outlined. The molecules of cyclopentadiene obtained in situ are lattice.
