The vibrational spectra of simple cobalt(III) and chromium(III) ammine complexes
01 Jul 1970-Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy (Elsevier)-Vol. 26, Iss: 7, pp 1559-1565
TL;DR: In this paper, the laser Raman spectral data for solid [Co(NH3)6]X3 (where X = Cl, Br and I), [Co[NH3]5Cl]Cl2, cis-and trans-[Co[Co( NH3)4Cl2]Cl, and the sulfate and pentachlororocuprate (II) of Cr(NH 3)63+, together with Raman spectra of aqueous solutions of Co[NH 3]63+ and Co[Co
About: This article is published in Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy.The article was published on 1970-07-01. It has received 18 citations till now. The article focuses on the topics: Raman spectroscopy.
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TL;DR: In this paper, surface-enhanced Raman scattering (SERS) has been observed at silver electrodes for several transition metal hexaammine complexes even though these cations cannot bind to the metal surface and are excluded from the electrochemical inner layer by the presence of a monolayer of chloride or bromide anions.
Abstract: Surface–enhanced Raman scattering (SERS) has been observed at silver electrodes for several transition‐metal hexaammine complexes even though these cations cannot bind to the metal surface and are excluded from the electrochemical inner layer by the presence of a monolayer of chloride or bromide anions The intensity of the SERS metal‐ammine stretching vibrations νM−N are comparable to those seen for closely related pentammine complexes that are bound to the surface via specifically adsorbed coordinated ligands For hexammineruthenium(III), changes in the νM−N frequency with potential indicate the presence of an interfacial Ru(NH3)3+/2+6 couple The formal potential of this couple obtained from the potential dependence of the SERS intensities is consistent with the Raman scattering ions being located at the outer Helmholtz plane The implications of these results to current models of SERS in electrochemical environments are noted
26 citations
TL;DR: In this paper, it was shown that reasonable force constants for the skeletons of hexammine and tetrammine metal complexes can be calculated from Raman and infrared data of the isotopically substituted ions using the point mass model, if the isotope shifts can be measured accurately.
19 citations
TL;DR: The phase transition in [Cr(NH 3 ) 6 ](BF 4 ) 3 at T c h =238.42 K and T c c c =237.93 K was determined by differential scanning calorimetry (DSC) as mentioned in this paper.
16 citations
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TL;DR: In this article, the ultra-violet and infra-red absorption spectra of a number of isomeric diammine (ethylenediamine)cobalt(III) compounds have been determined.
13 citations
9 citations
TL;DR: In this paper, it was shown that a large number of observed facts about co-ordination compounds can be explained on the assumption that these groups are held by purely electrostatic forces to the central atom.
Abstract: FOLLOWING J. J. Thomson, Kossel, and others, it can be shown that a large number of observed facts about co-ordination compounds can be explained on the assumption that these groups are held by purely electrostatic forces to the central atom. Grimm has been able to calculate the heat of association per molecule of NH3 surrounding the cation of a simple salt, from a knowledge of the heat of formation of the ammines and the lattice energy of the simple salt. He has shown that for a monovalent cation with an octet shell the heat of association is 14 calories per gram molecule, 28 calories for a divalent ion, and so on. Also, the maximum co-ordination number of an atom can be shown to depend on the relative size of the latter to those of the co-ordination groups.
7 citations