Synthesis,Characterization And Electrochemical Properties Of Molecular Wires Bridged By Biphenyl-Crown

In recent years, molecular electronics is becoming a hot spot of research. Its ultimate task is the construction, characterization and controlling the electron transport of molecular devices. As an important molecular device, molecular wires play an important role in the development of molecular electronics. The present study mainly concentrated in the electro-optical molecular line and pooring switch characteristics of photoelectric line reactive molecules. Certain molecules, although with photoelectric activity, poor reliability, sensitive to environment, easy fatigue, poor stability; The photoelectric activity of benzene alkyne (OPE) and styrene (OPV) molecular although stable but having not with switch effect; Compared with controllable non photoelectric reactive molecules structure, reversible changes in structure under external stimulation, showed good effect. Due to biphenyl chemical modification, chemical modification on the two benzene ring can system change two benzene ring plane Angle, its molecular conjugate degree of change, molecular electronic line run is to change. Crown ether can combine with cationic reconciliation, and as the structure change of the cationic size of different crown ether. Composed of biphenyl and crown molecules, crown ether to accept different cation of external stimulation, structure change, prompt biphenyl two benzene ring plane in different degree, thus affecting the molecular wire electron transport. This paper investigated using conventional electrochemistry and spectroscopy technology systems biphenyl crown ether pure organic molecular wires and electronic transmission behavior of the model compounds1. Synthesized with sulfur acetyl group biphenyl crown ether pure organic molecular conductor is (2-17,2-18) and its model compounds biphenyl crown ether bimetallic ruthenium complexes (2-21), all compounds are not seen the literature, and all compounds are both by 1HNMR,13 CNMR or31 PNMR characterization.2. The use of ultraviolet-visible-near infrared, infrared spectra and cyclic voltammograms, square wave voltammetric study of biphenyl conventional electrochemical technologies such as crown ether bimetallic ruthenium complexes in the spectral behavior and the electrochemical behavior of CH2Cl2 solution; And alkaline earth metal ions were studied with voltammetry (Li+, Na+, K+) on the electrochemical behavior of the impact. Experiments show that:(1) the crown cavity combined with ion, weaken the line density of electron cloud, although Li+can enhance biphenyl crown ether stability of base pairs of ruthenium complexes of mixed valence compounds, but the formation of mixed valence compounds is still unstable; (2) different cationic make biphenyl-crown with different torsion angle, with the increase of phenyl two benzene torsion angle, AE is reduced, degree of molecular conjugation.Different molecular ion regulation the same conductance can be realized.