4
Tetrahedron Letters
investigate in the mechanochromism of the compounds with
other acceptor moieties, and will report in due course.
Scheme 3 Proposed mechanism of the formation of crystal packing and of the color change by the mechanical grinding.
for 3: C26H21N3O2, triclinic, P-1, a = 7.7989(7) Å, b = 9.4503(8) Å,
c = 14.6987(12) Å, α = 91.5780(10) , β = 103.1870(10), γ=
104.6570(10)
, V = 1016.24(15) Å3, Z = 2, R = 0.0453, wR2
̊
̊
Supplementary data
̊
=
0.1183, T = 173 K (CCDC 1554376); Crystal data for 4:
C26H20N2O2S, triclinic, P-1, a = 8.850(2) Å, b = 11.022(3) Å, c =
11.549(3) Å, α = 76.819(3) ̊, β = 86.764(3),̊ γ= 85.685(3),̊ V =
Supplementary data associated with this article can be found
in the online version at
1092.9(5) Å3, Z = 2, R = 0.0484, wR2 = 0.1381, T = 173 K (CCDC
1554377). Crystallographic data were deposited with the
Cambridge Crystallographic Data Centre as supplementary
publication. The data are obtainable free of charge from the
Cambridge Crystallographic Data Center, 12 Union Road,
Cambridge CB2 1EZ, UK. Fax: +44 (0) 1223 336033 or e-mail:
References and notes
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9. Ethyl ester analogue of 4 did not show the mechanochromic
behavior.
10. Crystal data for 1: C30H19N3O2, monoclinic, P21/n, a = 8.7940(7)
Å, b = 27.059(2) Å, c = 9.9703(8) Å; β = 105.0460(10) ̊, V =
2291.2(3) Å3, Z = 4, R = 0.0428, wR2 = 0.1149, T = 173 K (CCDC
1554374); Crystal data for 2: C28H21NO2, triclinic, P-1, a =
9.7690(11) Å, b = 9.7883(11) Å, c = 23.930(3) Å, α = 81.529(2)
β = 80.5720(10), γ= 69.2500(10),
V = 2101.0(4) Å3, Z = 4, R =
0.0466, wR2 = 0.1428, T = 173 K (CCDC 1554375); Crystal data
̊,
̊
̊