MATRIX-ISOLATION INFRARED STUDIES OF MAGNESIUM CHLORIDE AND MAGNESIUM BROMIDE

The infrared spectra of monomeric and dimeric magnesium chloride and monomeric magnesium bromide trapped in solid argon at 4 to 10 K have been obtained. For the monomer MgCl//2, two band systems were observed at 603 and 585 cm** minus **1. The two bands appear to result from different matrix sites. For the MgBr//2 monomer an intense band system was observed in the region 490 to 530 cm** minus **1 with three strong bands at 502, 509, and 520 cm** minus **1 and shoulders at 495 and 526 cm** minus **1. For the dimer Mg//2Cl//4, bands were observed at 504, 410, and 515 cm** minus **1. These frequencies are shown to be consistent with an assumed chlorine bridged structure.