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ErCl2 is trigonal omega-like structured and crystallizes in the tetragonal P4_2/mnm space group. The structure is three-dimensional. Er is bonded to six equivalent Cl atoms to form a mixture of corner and edge-sharing ErCl6 octahedra. The corner-sharing octahedral tilt angles are 39°. There are two shorter (2.71 Å) and four longer (2.73 Å) Er–Cl bond lengths. Cl is bonded in a 3-coordinate geometry to three equivalent Er atoms.
In this study, UV-Vis spectrophotometric experiments were conducted from 25 to 75 °C using Er-HClO4-bearing solutions with varying NaCl concentrations. The molar absorbance coefficient of Er3+ decreases with temperature, and the absorbance intensity gradually decreases with increasing mCl/mEr ratios. The number of absorbing species include Er3+ and ErCl2+ even at the highest mCl/mEr ratio. The formation constant (β 1 ) for the ErCl 2+ species was derived and fitted between 50 and 250 °C with existing literature values, yielding the following equation: logβ 1 0 = −22.4315 + 0.0345T + 3.9379·10 3 /T, where T is temperature in Kevin.