Hydrated Metal Halide Structures and the HSAB ConceptA review of ligand coordination in the structures of hydrates of the bivalent Mg, Ca, Mn, Fe, Co, Ni, Cu, Zn and Cd halide salts is made. Differences in the type of environment around the Me2+ are satisfactorily explained using the HSAB (Hard and Soft Acids and Bases) concept: in all structures the tendency for a preferable combination hard cationhard ligand and soft cationsoft ligand is proved. The paper demonstrates the possibilities of the HSAB concept t o solve crystallochernical problems of the type of ligand coordination in the structures. CHeJIaH 0630p IIO KOOpAHHa4HH JIkIraHAOB B CTpyKTypaX raJlOreHHAOB rHAPaTOB &ByXBaJleHTHbIX Mg, Ca, Mn, Fe, C O , Ni, CU, Zn, Cd. Pa3JIII.iHR THIIOB OKpymeHHFI OKOJIO Me2+ 06'bRcHeHbI C I I O M O q b l O KOHqeII~HEi TBepAbIX Ei MIIrKIlX IEHCJIOT II OCHOBaHHfi nblOHCa: BO BCeX CTpYKTYpaX IIOKa3aHa TeHHeHUHH IE IIpeAIIOqTUTeJIbHOg H O M~H H~U H H TBepHOrO KaTEiOHa C TBepHbIM JIIIraHAOM I4 M R r K O r O IEaTHOHa C MRrKHM JIHraHAOM. P a 6 o~a AeMOHCTpIIpyeT BOBMOWHOCTH 3 T O g KOHUeII4HEI peuIaTb KpHCTaJIJIOXHMIlqeCHHe npo6ne-MhI 0 THllaX KOOpAEiHaUHH JIHraHHOB B KpHCTaJlnHYeCKIIX CTpyHTypaX.