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Kα, graphite monochromated, λ = 0.71073 Å). These structures were solved by using direct methods. After refinement of the non-hydrogen atoms, difference Fourier maps revealed maxima of residual electron density close to positions expected for hydrogen atoms. Hydrogen atoms were introduced as fixed contributors at calculated positions (C-H = 0.95 Å, B(H) = 1.3 Beqv(C)). All calculations were made by using the Nonius OpenMoleN package. [19] Neutral atom-scattering-factor coefficients and anomalous dispersion coefficients were taken from a standard source. [20] CCDC 228625 (30) and 228626 (38) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/retrieving.html (or from the Cambridge Crystallographic Data Centre, 12, Union Road, Cambridge CB21EZ, UK; fax: (+44)1223-336-033; or deposit@ccdc.cam.ac.uk).
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