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Fitted Karplus equation for Sn compounds: 3J = Acos(2ϕ) + Bcos(ϕ) + C. For each Sn–Sn torsion angle ϕ, the average of the 3JSnSn coupling constant over 13 compounds is computed. Blue, BH&HLYP/x2c-TZVPall-2c; red, GW-cBSE@BH&HLYP; and Exp., experimental findings.184 Adapted with permission from ref (61). Copyright 2022 the Authors.
