01600nas a2200157   4500008004100000022001400041245006400055210006400119260000800183300001400191490000700205520108700212100002201299700003001321856009101351       2019                        eng d  a2040-336400aConversion of curved assemblies into two dimensional sheets0 aConversion of curved assemblies into two dimensional sheets  cMAR  a5732-57360 v113 a<p>The design and preparation of organic two dimensional (O2D) sheets and their conversion to curved nanostructures is in its infancy. To convert a flat structure into a curved structure, the molecule must have multiple interaction possibilities and an in-built twist. The conjugated small molecule iso-Indigo (i-Indigo) comprises two phenyl rings that are twisted (the dihedral angle is 15 degrees) at the junction. The i-Indigo has been connected with moieties that impart hydrogen bonding and van der Waals interactions. Due to the presence of the cloud in i-Indigo, - interactions are also present in the molecule. While all three interactions are in operation, rings and toroids are formed. Upon addition of hydrogen bonding competing solvents, the rings and toroids unravel to form O2D sheets. Control molecules that don't have hydrogen bonding moieties and - interactions form random assemblies. Please note that the rings, toroids and O2D sheets are formed in a single solvent by simple dissolution, unlike previous approaches that involve multiple steps and solvents.</p>
1 aDeshmukh, Gunvant1 aKrishnamoorthy, Kothandam  uhttps://library.ncl.res.in/content/conversion-curved-assemblies-two-dimensional-sheets