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of II (Fig. 2b). The H(6)⋅⋅⋅O(3) distance was 2.72
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of this interaction as a linear hydrogen bond [38]. Secꢀ
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C(16)⋅⋅⋅C(21) atoms) of an adjacent molecule (
3.3469 = 2.6786 < 18 = 126.416
(Fig. 2c) [42, 43]. What’s more, compared with , the
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actions. These energetically favorable nonbonded
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those pairs with phenyl ring centroid separations >4.5
and <7 and dihedral angles within 30 of 90 [49].
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°
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ACKNOWLEDGMENTS
32. SMART (version 5.0), SAINT (version 6), SHELXTL
(version 6.1), and SADABS (version 2.03), Madison
(WI, USA): Bruker AXS Inc., 2000.
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This work was financially supported by the Hubei
National Science Foundation (no. 2009CDA022),
and the Education Office of Hubei Province
(nos. D20091704 & Q20101610).
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2013