Carbon nanohoops are a class of molecules consisting of aromatic sections curved out of planarity by the inherent cyclic geometry of the molecule. This class of molecules came into existence with the synthesis of

cycloparaphenylenes A cycloparaphenylene is a molecule that consists of several benzene rings connected by covalent bonds in the para positions to form a hoop- or necklace-like structure. Its chemical formula is or Such a molecule is usually denoted 'n''PP wher ...

Ramesh Jasti Ramesh Jasti is a professor of organic chemistry at the University of Oregon. He was the first person to synthesize the elusive cycloparaphenylene in 2008 during post doctoral work in the laboratory of Professor Carolyn Bertozzi. He started his ...

in the lab of

Carolyn Bertozzi Carolyn Ruth Bertozzi (born October 10, 1966) is an American chemist and Nobel laureate, known for her wide-ranging work spanning both chemistry and biology. She coined the term "bioorthogonal chemistry" for chemical reactions compatible with ...

and since then has been expanded into cyclonaphthylenes, cyclochrysenylenes, and even cyclohexabenzocoronenylenes. Moreover, several nanohoops containing such antiaromatic units as dibenzo ,eentalene and pyrrolo ,2-byrrole are reported. Carbon nanohoops often map on to a certain chirality of

carbon nanotube A scanning tunneling microscopy image of a single-walled carbon nanotube Rotating single-walled zigzag carbon nanotube A carbon nanotube (CNT) is a tube made of carbon with diameters typically measured in nanometers. ''Single-wall carbon nan ...

. If the diameter is adequate, these molecules can host a

fullerene A fullerene is an allotrope of carbon whose molecule consists of carbon atoms connected by single and double bonds so as to form a closed or partially closed mesh, with fused rings of five to seven atoms. The molecule may be a hollow sphere, ...

. For example, 0ycloparaphenylene can host a C₆₀ fullerene.

References

Cyclophanes Nanomaterials {{nano-tech-stub