Nanopatterning by Molecular Polygons

Abstract

Molecular polygons with three to six sides and binary mixtures thereof form long-range ordered patterns at the TCB/HOPG interface. This includes also the 2D crystallization of pentagons. The results provide an insight into how the symmetry of molecules is translated into periodic structures.

Molecular Polygons Probe the Role of Intramolecular Strain in the Photophysics of π‐Conjugated Chromophores

“…To address this problem, we introduce a series of cyclo‐oligomers consisting of n π‐conjugated units, based on phenylene–ethynylene–butadiynylenes, connected by apex moieties to yield molecular polygons . The chemical structures are shown in Figure ( n= 4: 4 ; n= 3: 3 ; n= 2: 2 and 2′ ).…”

Synthesis of a Covalent Monolayer Sheet by Photochemical Anthracene Dimerization at the Air/Water Interface and its Mechanical Characterization by AFM Indentation

“…This particularly holds when they are internally ordered and exhibit reasonable mechanical strength as individual sheet entities and thus, qualify as "2D Polymers" (2DPs). [ 2 ] Fields of applications that one can envisage [ 3 ] include chiral surfaces, [ 4 ] molecular electronics, [ 5,6 ] nanopatterning, [ 7 ] molecular landscaping, [ 8 ] acoustic sources, [ 9 ] chemiresistors, [ 10 ] nano-sieves, [ 11 ] hierarchical interactions, [ 12 ] stem-cell regulation, [ 13 ] phonontransport, [ 14 ] and molecular machines.[ 15 ] Ever since the fi rst polymerization experiments were conducted to obtain ultrathin fi lms at the air/water interface in 1930s, [ 16 ] numerous attempts were reported to create covalent monolayer sheets [ 1,[17][18][19][20] at air/ liquid and liquid/liquid interfaces as well as on solid substrates. While they led to intriguing developments and invaluable insights into the problems associated with approaching such synthetic targets, a key aspect remained unravelled: the longrange covalent order in the obtained sheets.…”

Highly Strained Phenylene Bicyclophanes

“…Enhanced understanding of 2D supramolecular engineering has led to an enhanced understanding of the essential key mechanisms of molecule-surface and molecule-molecule interactions. [1] Usually, aromatic compounds lie flat on the substrate. [2] Architectures with aromatic units aligned perpendicularly to the graphite surface are rarely observed [3] but may become of interest when functionalization towards the volume phase is desired.…”