Influence of spacer chain lengths and polar terminal groups on the mesomorphic properties of tethered 5-phenylpyrimidines.
Influence of spacer chain lengths and polar terminal groups on the mesomorphic properties of tethered 5-phenylpyrimidines.
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DOI:
10.3762/bjoc.5.63
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发表时间:
2009-11-09
影响因子:
2.7
通讯作者:
Laschat S
中科院分区:
文献类型:
--
作者:
Starkulla GF;Kapatsina E;Baro A;Giesselmann F;Tussetschläger S;Kaller M;Laschat S
Based on 5-(4-hydroxyphenyl)-2-octylpyrimidine 8, 5-phenylpyrimidine derivatives 3–7, 9 with different spacer chain lengths (C2 up to C6) and different terminal polar groups (Br, Cl, N3, OH, CN) were synthesized by etherification and nucleophilic substitution. The mesomorphic behaviour of these compounds was investigated by differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and X-ray diffraction (WAXS and SAXS) and revealed smectic A mesophases for bromides, chlorides and azides 3, 4 and 6. For these compounds a maximum phase width was observed for the C5 spacer regardless of the terminal group, whereas the hydroxy- and cyano-substituted derivatives 5 and 7, respectively, were non mesomorphic and showed only melting transitions.
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影响因子:
--
作者:
Neumann, B;Hegmann, T;Tschierske, C
通讯作者:
Tschierske, C
影响因子:
4.4
作者:
Adamo, C;Barone, V
通讯作者:
Barone, V
影响因子:
--
作者:
Li, Li;Jones, Christopher D.;Lemieux, Robert P.
通讯作者:
Lemieux, Robert P.
DOI:
10.1080/10587259408047176
发表时间:
1994-01-01
影响因子:
--
作者:
SUGITA, S;TODA, S;MURAYAMA, A
通讯作者:
MURAYAMA, A
影响因子:
0.7
作者:
SUGITA, SI;TAKENO, H;TERAJI, T
通讯作者:
TERAJI, T