The calculated values of third-order polarizability γ(×10⁻³⁶ esu) along with its individual components as for compounds 1, 2, 3 and p-NA at M06/6-311G* levels of theory^a.

γ	1	2	3	p-NA
γ xxxx	8.883	1.947	16.01	0.13
γ yyyy	4.091	14.13	189.6	6.87
γ zzzz	642.0	511.6	724.0	128.4
γ xxyy	2.684	14.49	9.046	0.38
γ xxzz	−2.395	54.21	22.13	1.81
γ yyzz	−1.370	38.07	375.6	−6.29
〈γ〉	131.6	134.6	348.7	25.45
η a	5.17	5.20	13.70	1

^aThe η is ratio of 〈γ〉 amplitudes of each compound with 〈γ〉 of p-NA.