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[36], developed via difference syntheses, and refined on
F2 by full-matrix-least squares (SHELXL-96) [37] using
all unique data with intensities greater than zero. In all
cases, the phenyl rings were treated as idealized
,
hexagon (CꢀC=1.390 A, CꢀCꢀC=120.0°), the nonhy-
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4. Supplementary material
Crystallographic data for the compounds have been
deposited with the Cambridge Crystallographic Data
Centre, CCDC Nos. 169489 (3), 169490 (4a) and
169491 (4b). Copies of this information may be ob-
tained free of charge from The Director, CCDC, 12
Union Road, Cambridge, CB2 1EZ, UK (fax: +44-
1223-3360333 or e-mail: deposit@ccdc.cam.ac.uk or
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Acknowledgements
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The support of this research by the Ministry of
Science and Technology, Government of the Peoples
Republic of Bangladesh is gratefully acknowledged.
K.M.A.M. is grateful to Professor M.B. Hursthouse for
access to the EPSRC supported X-ray data collection
Service.
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