Parallel and Perpendicular Packing in Mixed-Stack Cocrystals of Trimeric Perfluoro-<i>ortho</i>-phenylene Mercury and Benzo[1,2-<i>b</i>:6,5-<i>b</i>′]dithiophene-4,5-dione Derivatives
作者:Raúl Castañeda、Marina S. Fonari、Chad Risko、Yulia A. Getmanenko、Tatiana V. Timofeeva
DOI:10.1021/acs.cgd.6b00001
日期:2016.4.6
Seven cocrystals derived from 2,7-substituted benzo[1,2-b:6,5-b′]dithiophene-4,5-diones (BDDO) and trimeric perfluoro-o-phenylene mercury (TPPM) exhibit two prominent packing motifs: parallel mixed stacks and T-shaped columnar structures. The varied packing patterns reveal an interplay of noncovalent intermolecular interactions that depend on the nature of the BDDO 2,7-substituents and on the crystallization conditions. Quantum-chemical analyses show little charge-transfer character in the mixed-stack structures, suggesting limited electronic interaction among the mixed TPPM and BDDO constituents. The variations in molecular packing with rather minimal change in chemical structure expose the ability to fine-tune the structure of these molecular cocrystals.
七种由2,7-取代苯并[1,2-b:6,5-b′]二硫酮-4,5-二氧(BDDO)和三聚体氟代邻苯汞(TPPM)衍生的共结晶体展示了两种显著的堆叠模式:平行混合堆叠和T型柱状结构。多样的堆叠模式揭示了依赖于BDDO 2,7-取代基性质和结晶条件的非共价分子间相互作用的相互影响。量子化学分析表明混合堆叠结构中电荷转移特性较弱,暗示混合的TPPM和BDDO成分之间的电子相互作用有限。分子堆叠的变化在化学结构几乎没有变化的情况下展现了微调这些分子共结晶体结构的能力。