Recent Advances in Boron-Containing Acenes:Synthesis,Properties,and Optoelectronic Applications

Acenes with linearly fused benzene rings have attracted much attention due to their intriguing optical and electronic properties.Nevertheless,the poor ambient stability of longer acenes has hampered the investigation of their physicochemical properties and potential applications.The incorporation of main group elements into the acene backbones provides a viable strategy to enhance the stability,and meanwhile,generates a new family of heteroatom-doped acenes(namely heteroacenes)with modified properties and functions.In particular,boron-containing acenes represent an attractive class of heteroacenes owing to the existence of vacant p orbital of boron,which endows theπ-conjugated systems with appealing features,such as Lewis acidity,electron-accepting capability,stimuli-responsivity,and adjustable photophysical properties.During the past decade,significant progress has been achieved in the synthesis and applications of boron-containing acenes,but a focused review on this topic has been elusive.Here,we summarize the recent advances in the studies on boron-containing acenes,covering their synthesis,intriguing properties,and various applications in electroluminescence and electronic devices,as well as in biosensors,etc.We hope that this timely review will stimulate new research interest in this unique family of materials and promote their optoelectronic applications.

Organic dyes containing fused acenes as building blocks： Optical, electrochemical and photovoltaic properties

Two D-π-A dyes based on fused acenes（carbazole, cyclopenta[2,1-b：3,4-b＇]dithiophene（CPDT） and dithieno[3,2-b：2＇,3＇-d]pyrrole（DTP）） were synthesized, characterized using UV-vis absorption spectroscopy and electrochemistry, density function theory（DFT） calculations, and used as sensitizers in dyesensitized solar cells（DSSCs）. The two sensitizers were compared thoroughly over physicochemical properties and DSSC performance. Although the DTP dye has slightly blue-shifted and weaker incident photon-to-collected electron（IPCE） conversion efficiency responses, the much increased open-circuit photovoltage values and improved charge-transfer kinetics relative to the CPDT systems result in superior power conversion efficiencies. This work reveals the potential of DTP as a bridge in the design of sensitizers.

Nano Structures and Its Thermodynamic Properties Using TIM

Manufacturing parts in nanoscale and investigating their properties has involved some limitations, and in some cases it is practically impossible;therefore, scholars have recently focused on micro-parts in natural scale, which has led to the advent of the field of nanostructures. Phenacenes with formula C4n+2H2n+4 are a family of organic molecules which have received a lot of attention in nanoscale. However, investigating the thermodynamic properties is highly expensive, especially when there are more than 6 loops. The present study was conducted in order to predict the thermodynamic properties of phenacenes family bu using Topological Indices Method (TIM). Topological index is a numeral molecular graph which is referred to as molecular graph. This number indicates some molecular properties. One of the topological indices is RRR which is investigated and measured in phenacenes family. Afterwards, by calculating Heat of Formation and Gibbs Energy for some members of this family and comparing them with data provided by valid articles, we could propose an appropriate model to predict some thermodynamic properties of this family.