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Complexes of the dipeptide phenylalanine–phenylalanine (Phe–Phe) with divalent metal cations (Cu2+, Zn2+, Ca2+ and Ba2+) were studied at the B3LYP and MP2 levels of theory with the basis sets 6-311++G(d,p) and 6-31 + G(d) in the gas phase. The relative energies of these complexes indicated that cation–π bidentate/tridentate conformations are more favourable than other conformations with uncoordinated...
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