Bulking Up the Bay-Position Substituents Enables Enhanced Selectivity of C_(s)‑Symmetric Boron Subphthalocyanine−Subnaphthalocyanine Hybrids  

作　　者：Nina F.Farac Alan J.Lough Timothy P.Bender 

机构地区：[1]Department of Chemical Engineering and Applied Chemistry,University of Toronto,Toronto,Ontario M5S 3E5,Canada [2]Department of Chemistry,University of Toronto,Toronto,Ontario M5S 3H6,Canada [3]Department of Materials Science and Engineering,University of Toronto,Toronto,Ontario M5S 3E4,Canada [4]Department of Mechanical and Industrial Engineering,University of Toronto,Toronto,Ontario M5S 3G8,Canada

出　　处：《Precision Chemistry》2024年第4期161-181,共21页精准化学（英文）

摘　　要：The precise synthesis of subporphyrinoid hybrids withπ-expanded topologies and unique material properties plays a promising role in the design of functional macrocycles.Easy,selective,and controllable routes to boron subphthalocyanine−subnaphthalocyanine hybrids,Bsub(Pc_(3‑p)-Nc_(p))s,are desirable for this purpose yet synthetically challenging due to random mixtures of C_(s-),C_(3v-),and,in some cases,C_(1)-symmetric compounds that form during traditional statistical mixed cyclotrimerizations.Herein,we addressed this issue by developing a sterically driven mixed cyclotrimerization with enhanced selectivity for the targeted C_(s)-symmetric hybrid and complete suppression of sterically crowded macrocyclic byproducts.This process,coupled with a rationally designed precursor bearing bulky phenyl substituents,enabled the synthesis and characterization of bay-position phenylated Ph_(2)-(R_(p))_(8)Bsub(Pc_(2)-Nc_(1))hybrids with halogens(Rp=Cl or F)in their peripheral isoindole rings.Reaction selectivity ranged between 59 and 72%with remarkable yields,significantly higher than that of conventional mixed cyclotrimerizations.These findings were augmented by theoretical calculations on precursor Lewis basicity as guiding principles into hybrid macrocycle formation.Additionally,the incorporation of unfused phenyl groups and halogen atoms into the hybrid framework resulted in fine-tuned optical,structural,electronic,and electrochemical properties.This straightforward approach achieved improved selectivity and controlled narrowing of the product distribution,affording the efficient synthesis of structurally sophisticated Bsub(Pc_(2)-Nc_(1))hybrids.This then expands the library of 3-dimensionalπ-extended macrocycles for use in a range of applications,such as in optoelectronic devices with precisely tailored optical properties.

关 键 词：SUBPHTHALOCYANINE HYBRIDS low-symmetry aromatic macrocycle selective cyclotrimerization sterically driven chemistry broad absorption material properties 

分 类 号：O62[理学—有机化学]