Among the [ Ch CN] • series, this frequency also exhibits a decreasing trend upon lighter to heavier Ch elements, from 1951 cm −1 for [OCN] • , [ 34 ] to 735 cm −1 for [SCN] • , [ 34 ] to 565 cm −1 for [SeCN] • , [ 35 ] and to 468 cm −1 for [TeCN] • .
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