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Volumn 36, Issue 7, 1997, Pages 745-748

Ab Initio Density Functional vs Hartree Fock Predictions for the Structure of [18]Annulene: Evidence for Bond Localization and Diminished Ring Currents in Bicycloannelated [18]Annulenes

Author keywords

Ab initio calculations; Annulenes; Aromaticity; Bond length alternations; Density functional calculations

Indexed keywords


EID: 0030835862     PISSN: 05700833     EISSN: None     Source Type: Journal    
DOI: 10.1002/anie.199707451     Document Type: Article
Times cited : (36)

References (51)
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  • 17
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    • M. Nendel, K. N. Houk, L. M. Tolbert, E. Vogel, H. Jiao, P. von R. Schleyer, Angew. Chem. 1997, 109, 760; Angew. Chem. Int. Ed. Engl. 1997, 36, 748.
    • (1997) Angew. Chem. Int. Ed. Engl. , vol.36 , pp. 748
  • 21
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    • note
    • RHF calculations were performed with the aid of analytically determined gradients and the search algorithms contained within GAMESS [19], by using the 6-31G(2d,p) [20,21] and dzv(2d,p) basis sets [22]. These basis sets include two sets of six d polarization functions on all heavy atoms, and one set of p polarization functions on hydrogen atoms. DF calculations using sufficient nonlocal potentials were performed by using the DF formalism within CADPAC [23] and G94 [24], and by using the dz(ndmf.qp) basis sets [25] where n = 1, 2, m = 0, 1, and q = 0-2. In addition, a variety of functionals (including BPW91 [26,27], B3PW91 [28], and B3PLYP [27,28]) were considered for geometry optimization of 1 in order to establish an appropriate level of theory before the more costly calculations involving 2 were undertaken. The results of the DF calculations were compared with those of the more traditional MP2 [29,30] technique. It was found that all DF and MP2 methods behaved essentially equivalently in this study, and that the accuracy of the results is more dependent on quality of basis set. Based on assessments of the results of 1, it was then considered most economical to optimize the geometry of 2 at only the BPW91/dz(d) level of theory. Frequency calculations were performed where appropriate to establish the character of minima found. The quantitative measure of the delocalization stabilization was estimated by using one of a variety of possible reaction schemes for bond sparation [31, 32]. We have previously found that a similar qualitative picture results over all treatments [3334]. Additionally, NMR shielding tensors were calculated from fully optimized structures at select levels of theory, by using the Gauge-Independent Atomic Orbital (GIAO) method [35-37]. As with the geometry optimizations, several basis sets were used for NMR calculations on [18]annulene (1) and we found these levels to be self-consistent. Such basis sets [38,39] are necessary to describe properly the NMR properties of structures with such complex interactions [40-42].
  • 48
    • 33748224437 scopus 로고
    • H.-B. Bürgi, K. K. Baldridge, K. Hardcastle, N. L. Frank, P. Gantzel, J. S. Siegel, J. Ziller, Angew. Chem. 1995, 107, 1575; Angew. Chem. Int. Ed. Engl. 1995, 34, 1454.
    • (1995) Angew. Chem. Int. Ed. Engl. , vol.34 , pp. 1454
  • 51
    • 0347762185 scopus 로고    scopus 로고
    • Energy value in brackets includes the thermal and scaled zero-point vibrational energy corrections for 1
    • Energy value in brackets includes the thermal and scaled zero-point vibrational energy corrections for 1.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.