Among them hydrogen-π interactions [4 7] are an extensive interaction type in organic and biological molecules, referring to the interactions between hydrogen atoms, attaching to different atomic groups, and aromatic molecules or π-groups.
The next challenge was to substitute other atoms for the eight hydrogen atoms attached to cubane's corners.
An amino acid consists of a carbon atom with four groups of atoms attached to it.
Essentially, the molecule consists of a backbone of carbon atoms with attached hydrogen atoms; attached to every other carbon atom is a pendant methyl group (CH3).
In the 1980s scientists discovered that proteins in animals often have isoprenoid structures containing 15 or 20 carbon atoms attached to a particular side chain of the protein.
Its particular frequency will vary, depending on the nature of the atoms or groups of atoms attached to the carbon atom but will generally occur in the region of 1,650 1,750 cm−1,650 1,750
Dana Dlott and colleagues at the University of Illinois at Urbana-Champaign used a two-dimensional system of hydrocarbons that contained 6 to 24 carbon atoms attached to a gold surface to examine their vibrational movements while heated.
For example, the broad 254-nanometre transition in benzene (C6H6) can be shifted by the substitution of various organic groups for one or more of the hydrogen atoms attached to the carbon ring.
The natural fibres of proteins such as hair, wool, and silk are also polymers that contain the repeating unit (-CHRCONH-), where R is a group of atoms attached to the main polymer.
With financial support from the Army, which was seeking a more powerful military explosive than any available, Dr. Eaton and his colleagues embarked on a program aimed at removing the hydrogen atoms attached to a cubane molecule's corners, and substituting nitro groups in their places.
