“…37 In agreement with the larger red shift of both HE and ME electronic absorption bands of 8 and 9 with respect to 1, due to a more significant ICT process, both theoretical and experimental 1907 values are much higher for 8 and 9, carrying stronger electron withdrawing groups with respect to other chromophores (Tables 5A and 5B Finally, it is of interest to compare the magnitude of static 0 values of 1, 7-11, not dependent on the wavelength of the incident light, with static 0 values reported by Miller et al 18 for a series of structurally related DA (donor-acceptor) ICT chromophores based on various Narylpyrazoles, lacking the ferrocenyl moiety. In accordance with a more significant ICT process, DDA (donor-donor-acceptor) chromophores 1, 7-11, based on the ferrocenyl N-aryl pyrazole structure, show 0 values between 52.1 and 97.1 x 10 -30 esu, much higher than those of the series of the structurally related DA chromophores, reported by Miller et al,18 which show 0 values between 4.6 and 30.7 x 10 -30 esu.…”