Do triatomic molecules echo atomic periodicity?

Abstract

Abstract. Demonstrations of periodicity among triatomic-molecular spectroscopic constants underscore the role of the periodic law as a foundation of chemistry. The objective of this work is to prepare for another test using vibration frequencies ν 1 of free, ground-state, main-group triatomic molecules. Using data from four data bases and from computation, we have collected ν 1 data for molecules formed from second period atoms.

Periodic trends in constants of triatomic molecules

“…The earliest attempts at visualizing the trends in the vibrational frequencies of triatomic molecules were made before computation even began. From tabulated empirical data alone, Hefferlin single handedly created a schema to show quadratic trends in ν 1 , using the triatomic space organization to consider isoelectronic series of molecules which were further organized by central atom group number . Data exhibiting a roughly parabolic trend can be denoted as a Hefferlin series .…”

“…From tabulated empirical data alone, Hefferlin single handedly created a schema to show quadratic trends in m 1 , using the triatomic space organization to consider isoelectronic series of molecules which were further organized by central atom group number. [1] Data exhibiting a roughly parabolic trend can be denoted as a Hefferlin series. Each of these series represents the molecules which lie within the angled isoelectronic planes of the lesser triatomic space.…”

“…Work done by Hefferlin and Kong over the past forty years has shown that diatomic and triatomic molecules share many periodic properties with the Mendeleev's periodic table of elements. This work acts as a direct extension from the periodic systems of atoms to triatomic molecules.…”