Table 4. Amide bridge interaction energies between the two amide amino acids (Asn and Gln).

	MP2	/6–311+	G(d,p)		CCSD(T)	/6–311+	G(d,p)
Interaction	Gaseous	phase	Aqueous	phase	Gaseous	phase	Aqueous	phase
pairs	ΔE s-b	Bond	ΔE s-b	Bond	ΔE s-b	Bond	ΔE s-b	Bond
	kJ/mol	Å	kJ/mol	Å	kJ/mol	Å	kJ/mol	Å
Asn-Asn	-61.90	1.884	-9.407	2.102	-69.28	1.862	-13.61	1.984
Asn-Gln	-52.57	1.943	-9.254	2.292	-67.80	1.881	-11.78	2.005
Gln-Gln	-59.07	1.902	-12.766	2.183	-68.41	1.863	-12.75	1.990