Crystal Growth & Design
Article
HSM was performed on PolythermA Hot Stage and Heiztisch
microscope supplied by Wagner & Munz. A Moticam 1000 (1.3 MP)
camera supported by Motic ImagePlus 2.0 ML software to record
images.
CD Spectra. Solid state and solution state CD spectra were
recorded on JASCO J-810 CD spectrophotometer at University of
Nottingham. Solid-state CD experiments were carried out by
mounting KBr pellets of form I at concentration range of 0.8−1%.
Solution state CD measurements were recorded in ethanol at
concentration of 10 mg/mL.
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ASSOCIATED CONTENT
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S
* Supporting Information
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Growth Des. 2008, 8, 140−154. (b) Nath, N. K.: Nangia, A.,
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Table S1: Crystal data on three different crystals of 2-t-Bu form
I using Cu-Kα radiation to determine the absolute chirality;
Table S2 CSD refcodes of chiral/achiral polymorph clusters
containing a t-butyl group in the molecule; Figure S1: M
helicity of 2-t-Bu molecule in the chiral crystal structure of
polymorph I; Figure S2: Conformational change of t-butyl
group as the Me group rotates from 130° to 150°; Figure S3: 4-
t-Butyl-2-(2,2-dimethyl-1-methylthiopropylidene)-1,3-dithiole
(CSD refcode BMTPRD); Figure S4: Phase transition (Form II
to Form III to Form I). Figure S5: Phase transition (Form III to
Form I). Scheme S1: Sequence of steps which afforded
concomitant polymorphs of 2-t-Bu. Scheme S2: Standardized
protocol for the reproducible crystallization of 2-t-Bu concom-
itant polymorphs in multiple batches. This material is available
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AUTHOR INFORMATION
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Corresponding Author
(15) (a) Lennartson, A.; Wiklund, T.; Hakansson, M. CrystEngComm
̊
Notes
2007, 9, 856−859. (b) Vestergren, M.; Johansson, A.; Lennartson, A.;
The authors declare no competing financial interest.
Hakansson, M. Mendeleev Commun. 2004, 258−260. (c) Lennartson,
̊
A.; Vestergren, M.; Hakansson, M. Chem.Eur. J. 2005, 11, 1757−
̊
ACKNOWLEDGMENTS
1762.
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(17) (a) Hu, C.; Englert, U. Angew. Chem., Int. Ed. 2005, 44, 2281−
2283. (b) Avarvari, N.; Faulques, E.; Fourmigue, M. Inorg. Chem. 2001,
́
This research was funded by DST (SR/S1/OC-67/2006 and
SR/S2/JCB-06/2009). N.K.N. thanks the UGC for a fellow-
ship.
40, 2570−2577. (c) Supriya, S.; Das, S. K. J. Am. Chem. Soc. 2007, 129,
3464−3465. (d) Zhang, Y.-J.; Liu, T.; Kanegawa, S.; Sato, O. J. Am.
Chem. Soc. 2009, 131, 7942−7943. (e) Vittal, J. J. Coord. Chem. Rev.
2007, 251, 1781−1795. (f) Kaftory, M.; Botoshansky, M.; Kapon, M.;
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Ito, Y. CrystEngComm 2010, 12, 1628−1634. (h) Das, D.; Engel, E.;
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