Ionization potential (I), electron affinity (A), electronegativity (X), global hardness (η), chemical potential (μ), global electrophilicity (ω), electron donor capability (ω⁻), electron acceptor capability (ω⁺) and global softness (σ) values of 6a–d (units in eV).

Com	I	A	X	η	μ	ω	ω −	ω +	σ
6a	4.80	4.43	4.62	0.18	−4.62	57.42	59.75	55.13	2.69
6b	5.46	4.63	5.04	0.41	−5.04	30.79	33.36	28.32	1.21
6c	5.20	4.43	4.81	0.38	−4.81	30.09	32.55	27.73	1.30
6d	5.14	4.43	4.78	0.35	−4.78	32.16	34.59	29.81	1.41