Infrared spectra of the matrix-isolated chlorides of iron, cobalt, and nickel

A Critical Appraisal of the Experimental Data on the Molecular Structure and Spectra of Halides, Oxides, and Hydrides of the s-, d-, and f-Block Elements

“…In very careful experiments in argon matrices, Green et al [40] determined a bond angle of 1618, although the observed shifts in n Ä 3 for isotopic substitution of chlorine, which give an upper limit for the angle, were only 0.04 ( [15] reported similar results in argon, but in nitrogen a major shift of over 90 cm À1 occurred in the position of n 3 , and a bond angle of 1308 was reported. In this work separate samples of Ni 35 Cl 2 and Ni 37 Cl 2 were simultaneously vaporized to obtain the frequencies of these components without the added complication of an intense Ni 35 Cl 37 Cl peak.…”

“…Inspection of Figure 4 shows that the bond angles of 1618, 1578, and 1618 reported [40] for FeCl 2 , CoCl 2 , and NiCl 2 , respectively, cannot be reliably differentiated from linearity. We are then left with very little evidence of nonlinearity in the first-row transition element dihalides.…”

High-Resolution Visible Laser Spectroscopy of Cobalt Monochloride

“…These systems were analyzed vibrationally and tables of upper and lower state vibrational constants were provided. However, none of the lower state vibrational frequencies given correspond to the proposed ground state frequency of G 1/2 = 453.72 cm −1 derived from the IR matrix-isolated work of Green et al (5). In addition, no rotational information for CoCl was provided until the work of Darji et al (7), where the I 1 system was investigated.…”

“…Emission spectra attributable to chlorides of iron, nickel, and cobalt were reported. Since that time there have been only a few references to the spectrum of CoCl (3)(4)(5)(6)(7). The visible spectrum is known to consist of several fragmentary electronic systems in the region 420-795 nm which over time have been designated as A, B, C, D, E, F, G, H, H 1 , I, I 1 , J, J 1 , K, L, M [1][2][3][4][5][6][7] , N 1 , N 2 , and O for want of definitive information as to the classification of the electronic states.…”

Rotational Analysis of Bands in the 360-nm System of NiCl2: Indications of Interacting States

“…phase (10,11) and in a matrix (5,12,13 (n 3 ) and the other at 85 cm 01 (13) which is the bending 4.5. Perturbations.…”