J. Bellows, P. Prasad
Dec 15, 1977
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0
Influential Citations
12
Citations
Journal
Journal of Chemical Physics
Abstract
Molecular motions of 1,4‐dihalonaphthalenes and their binary solid solutions are studied by Raman spectroscopy to understand the effect of chemical perturbation of the lattice stability. In the 1,4‐dihalonaphthalene series, 1,4‐dichloronaphthalene and 1‐bromo‐4‐chloronaphthalene are isomorphous but the additional chemical perturbation by another bromine atom creates a lattice instability which results in a different crystal structure for 1,4‐dibromonaphthalene. Not only is the binary organic alloy (solid solution) of 1,4‐dichloronaphthalene with 1‐bromo‐4‐chloronaphthalene stable for all composition, but 1‐bromo‐4‐chloronaphthalene shows large solubility with 1,4‐dibromonaphthalene as well. In both alloys, all phonons are amalgamated and so are some internal vibrations which are predominantly nonhalogen modes. In the 1‐bromo‐4‐chloronaphthalene alloy with 1,4‐dibromonaphthalene, the lattice is unstable in the critical concentration region with mole fraction of 1,4‐dibromonaphthalene between 0.24 and 0.44....