W Tungsten

Self-assembled monolayers of a series of tetraalkoxy-substituted octadehydrodibenzo[12]annulene (DBA) derivatives 1 c-g possessing butadiyne linkages were wilful at the 1,2,4-trichlorobenzene (TCB) or 1-phenyloctane/graphite interface by scanning tunneling microscopy (STM). The motivation of this inquiry is not only to investigate the structural permuting of two-dimensional (2D) monolayers, but also to assess a feasibility for peri-benzopolyacene composition by two-dimensionally controlled polymerization on a at first glance. As a result, the accumulation of three structures, porous, linear, and lamella structures, were observed by changing the alkyl series length and the solute concentration. The composition of multilayers of the lamella system was frequently observed for all compounds. The selection of molecular networks is basically ascribed to intermolecular and molecule-substrate interactions per segment enclosure and network density. The picky appearance of the linear design of 1 d is attributed to favorable epitaxial registry complementary between the substrate lattice and the overlayer lattice. Out notwithstanding that the closest interatomic interval negotiator the diacetylenic units of the DBAs in the lamella structure ([ap]0.6 nm) is a little larger compared to the ordinary distances vital for topochemical polymerization, the reactivity toward surface stimuli (electronic-pulse irradiation from an STM tip and UV irradiation) was investigated. Unfortunately, no reveal for polymerization of the DBAs on the surface was observed. The present results show the extreme for further designing a applicable approach for the on-surface construction of structurally fresh conjugated polymers, which are in another situation finicky to groom <<>>