caa a22 4500 465808433 CHVBK 20180323112109.0 cr unu---uuuuu 170327e19900301xx s 000 0 eng 10.1007/BF01160492 doi (NATIONALLICENCE)springer-10.1007/BF01160492 Effective length of benzannellated terminal groups in polymethine dyes [Elektronische Daten] [G. Dyadyusha, A. Kachkovskii, M. Dekhtyar'] The effect of benzannellation on the effective length of the terminal groups was studied by the method of asymptotic nonbonding MOs in the approximation of dyes with an extremely long polymethine chain. Both alternant and nonalternant conjugated hydrocarbon systems were examined. The variation of the effective length in relation to the number of added benzene rings was investigated. It was shown that the effect of annellation can be assessed by using the concept of equivalent terminal groups and the theory of perturbations in the asymptotic nonbonding MOs of polymethine dyes. Examples of the extension of the obtained relationships to heterocyclic terminal groups are given. The proposed approach makes it possible to interpret the cases where benzannelation is accompanied by a hypsochromic effect. Plenum Publishing Corporation, 1990 Dyadyusha G. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, Kiev aut Kachkovskii A. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, Kiev aut Dekhtyar' M. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, Kiev aut Theoretical and Experimental Chemistry Kluwer Academic Publishers 26/2(1990-03-01), 130-135 0040-5760 26:2<130 1990 26 11237 https://doi.org/10.1007/BF01160492 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01160492 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dyadyusha G. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, Kiev aut NATIONALLICENCE 700 1- Kachkovskii A. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, Kiev aut NATIONALLICENCE 700 1- Dekhtyar' M. Institute of Organic Chemistry, Academy of Sciences of the Ukrainian SSR, Kiev aut NATIONALLICENCE 773 0- Theoretical and Experimental Chemistry Kluwer Academic Publishers 26/2(1990-03-01), 130-135 0040-5760 26:2<130 1990 26 11237 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer