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Figure 1. a) Alternate molecular stacking of (Z,Z)-2, (E,E)-2, and (E,Z)-2 in a columnar structure in the
crystals. The benzyl groups are omitted here for clarity. (Z,Z)-2 and (E,E)-2 produce the same stereoregu-
lar polymer, that is, the racemo-disyndiotactic-2,5-trans polymer, through the topochemical polymerization,
while (E,Z)-2 provides a meso-disyndiotactic-2,5-trans polymer. b) 13C NMR spectra of racemo-disyndiotac-
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The monomer crystals were placed in a pyrex tube, which was
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NMR, IR, and UV spectra were recorded on a JEOL JMN A-400,
JASCO Herschel FT-IR-430, and JASCO V-550 spectrometer,
respectively. The powder X-ray diffraction data were collected with
a Rigaku RINT-2100 diffractometer with monochromated CuKa
radiation (l = 1.5418 , 30 kV, 20 mA, scan speed 1 degminÀ1). The
thermogravimetric/differential thermal analysis measurements were
carried out using a Seiko TG/DTA 6200 in a nitrogen stream at a
heating rate of 108CminÀ1
.
Received: January 12, 2004 [Z53738]
Keywords: crystal engineering · polymerization · solid-state
.
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[17] The stereochemistry of these polymers is represented by the
following two kinds of relationships: 1) the relative configura-
tion between the two repeating monomer units: when all the
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