Several correlations have been shown between infrared stretching frequencies of certain bonds and the electronegativities of the atoms involved : however, this is not surprising as such stretching frequencies depend in part on bond strength, which enters into the calculation of Pauling electronegativities.
12.
The antisymmetric stretching frequency, ? 3 of the bond is 1912.8 cm " 1, 57.34473 THz for isotopes 202 Hg and 1 H . The energy needed to break the Hg-H bond in HgH 2 is 70 kcal / mol.
13.
The Raman spectrum of nitrogen clathrate shows a N-N stretching frequency at 2322.4 cm " 1, this is smaller than for nitrogen dissolved in water ( 2325.0 cm " 1 ) and gaseous nitrogen ( 2327.7 cm " 1 ).
