The chlorineKabsorption spectra from MnCl2sdot;4H2O, FeCl2sdot;nH2O, CoCl2sdot;6H2O, NiCl2sdot;6H2O, and CuCl2sdot;2H2O have been investigated using a 50 cm benthyphen;quartz crystal vacuum spectrograph. Chemical shifts are found for the first absorption maximum and discussed in relation to thedhyphen;electron affinities of the divalent metal ions. The first maxima are attributed to the transitions from the chlorine 1slevel to the empty antibonding orbitals originating mainly from the metal 3dand chlorine 3porbitals. The other absorption structures are alike through five different hydrated dichlorides and are ascribed to the corehyphen;levelhyphen;tohyphen;emptyhyphen;state transitions in the Clminus;ion. The present spectra are compared with those of the anhydrous metal dichlorides MCl2(M = Mn, Fe, Co, Ni, and Cu) reported previously. It is illustrated that the first peaks are varied little by changing the anhydrides into the hydrates, but the other structures are considerably altered.
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