12 For
a review dealing with the application of LFERs to
7 have been deposited with the Cambridge Crystallographic
Data Centre and are available on request. Any such request
should be accompanied by a full bibliographic citation for
this work, together with the reference codes/numbers ZELFOL
(for [DB24C8ؒ1][PF6]),8a 100/689 (for [DB24C8ؒ10][PF6] and
[DB24C8ؒ11][PF6])21 and 188/135 (for [DB24C8ؒ2][PF6]–
[DB24C8ؒ9][PF6] and [DB24C8ؒ13][PF6]). For details of the
deposition scheme, see ‘Instructions for Authors’, J. Chem.
Soc., Perkin Trans. 2, available via the RSC Web page (http://
www.rsc.org/authors).
supramolecular chemistry, see: H.-J. Schneider, Chem. Soc. Rev.,
1994, 23, 227.
13 (a) L. P. Hammett and H. L. Pfluger, J. Am. Chem. Soc., 1933,
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14 For some other examples of Hammett correlations ‘beyond the
molecule’, i.e., involving supramolecular chemistry, see: (a)
R. Ungaro, B. El Haj and J. Smid, J. Am. Chem. Soc., 1976, 98, 5198;
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15 For leading references on this method, see: J. C. Adrian, Jr. and C. S.
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Acknowledgements
This research was supported in the UK by the Engineering and
Physical Sciences Research Council.
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Paper 8/02406E
Received 30th March 1998
Accepted 27th May 1998
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