J-coupling constants for a trialanine peptide as a function of dihedral angles calculated by density functional theory over the full Ramachandran space†
Abstract
We present 13 3J, seven 2J and four 1J coupling constants (24 in all) calculated using B3LYP/D95** as a function of the ϕ and ψ Ramachandran dihedral angles of the acetyl(Ala)3NH2 capped trialanine