For a central molecule with two sigma bonds, the magnitude of a construct of this type (*) decreases by one-third when a lone pair is present, which is the major difference between a linear and a bent molecule.
The magnitudes of constructs of this type are related to J-coupling constants in proton NMR spectroscopy, according to the Karplus equations. One construct of this type is also known as the "dihedral" type, and applies when four or more atoms are bonded in a straight chain. For a central molecule with two sigma bonds, the magnitude of a construct of this type (*) decreases by one-third when a lone pair is present, which is the major difference between a linear and a bent molecule. For 10 points, name these figures important in molecular geometry, which come in "bond" and "torsional" varieties, and are typically measured in degrees.
The magnitudes of constructs of this type are related to J-coupling constants in proton NMR spectroscopy, according to the Karplus equations.
{angles} [or torsional {angles}; or bond {angles}; or dihedral {angles}]