10 B. L. Lucht and D. B. Collum, Acc. Chem. Res., 1999, 32, 1035;
placed in calculated positions and refined using a riding model.
Those attached to boron, aluminium and four-co-ordinate
nitrogen were similarly treated but allowed to refine the A–H
length freely. Hydrogens on three-co-ordinate nitrogen were
allowed to refine freely. A summary of experimental parameters
for all six data collections is shown in Table 2.
CCDC reference numbers 212230–212235.
lographic data in CIF or other electronic format.
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A. P. Dickie, F. S. Mair, D. A. Middleton and R. G. Pritchard,
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15 F. S. Mair, R. Manning, R. G. Pritchard and J. E. Warren,
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Acknowledgements
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We are indebted to EPSRC (R. J. W., J. E. W.), Creators Ltd
(J. E. W.), and The Royal Society (F. S. M.) for studentship,
consumables and small equipment funding. F. S. M. wishes also
to thank UMIST for granting him a period of study leave, and
Strathclyde University for hosting it.
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D a l t o n T r a n s . , 2 0 0 3 , 3 7 9 2 – 3 7 9 8
3798