Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA.
J Am Chem Soc. 2012 Jun 20;134(24):10122-31. doi: 10.1021/ja302173y. Epub 2012 Jun 1.
We describe an approach to regular triangular arrays of dipolar molecular rotors based on insertion of dipolar rotator carrying shafts as guests into channels of a host, tris(o-phenylenedioxy)cyclotriphosphazene (TPP). The rotor guests can either enter the bulk of the host or stay at or near the surface, if a suitable stopper is installed at the end of the shaft. Differential scanning calorimetry, solid-state NMR, and powder X-ray diffraction were used to examine the insertion of a dipolar rotor synthesized for the purpose, 1-n-hexadecyl-12-(2,3-dichlorophenyl)-p-dicarba-closo-dodecaborane, and it was found that it forms a surface inclusion compound. Rotational barriers from 1.2 to 9 kcal/mol were found by dielectric spectroscopy and were attributed to rotors inserted into the surface to different degrees, some rubbing the surface as they turn.
我们描述了一种基于插入具有偶极子的分子转子作为客体进入主客体 tris(o-苯二氧代)环三磷腈 (TPP) 通道的方法，形成偶极子的规则三角阵列。如果在轴的末端安装合适的止动件，转子客体可以进入主体，或者停留在表面附近或表面上。差示扫描量热法、固态 NMR 和粉末 X 射线衍射用于研究为目的而合成的偶极子 1-正十六烷基-12-(2,3-二氯苯基)-p-二碳杂-closo-十二硼烷的插入，发现它形成了一种表面包合物。介电光谱法发现旋转势垒为 1.2 至 9 kcal/mol，归因于插入到不同程度的表面的转子，有些在旋转时摩擦表面。
