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Chromium (III) Acetate, Chromium (III) Acetate Hydroxide, or µ3-Oxo-esakis-(µ2-acetato-O,O') - triaqua-trichromium (III) Acetate? Determining the Structure of a Complex Compound by Analytical and Spectroscopic Methods

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Liliana Strinna Erre , Giovanni Micera , Tadeusz Glowiak and Henry Kozlowski

Department of Chemistry, University of Sassari, Via Vienna 2, 07100 Sassari, Italy

J. Chem. Educ., 1997, 74 (4), p 432

DOI: 10.1021/ed074p432

Publication Date (Web): April 1, 1997

Abstract

An experiment illustrating the use of infrared spectroscopy and model compounds to elucidate the structure of chromium (III) acetate is reported. Two commercial samples with the following conventional formulations Cr₃(CH₃CO₂)₇(OH)₂ and Cr(CH₃CO₂)₃ were examined and compared to the model compound [Cr₃(µ₂-CH₃COO)₆(µ₃-O)(H₂O)3]DHB·2H₂O, DHB = 2,6-dihydroxybenzoate(1-). The experiment may serve to illustrate the advantage of the joint application of analytical and spectroscopic data, in particular the use of symmetry concepts and IR-Raman selection rules, in the assignment of inorganic structures.

All the samples exhibit the distinctive vibrational features predicted for a trimetallic carboxylate complex with the µ₃-O-Cr₃ cage. Therefore, it may be concluded that chromium (III) acetates are endowed with a trimetallic arrangement where six acetates bridge three metal ions connected by a triply-bridging oxygen so that a total of four carboxylate oxygens surround each chromium ion. Water molecules act as the terminal ligands and complete an almost regular octahedral coordination polyhedron at each metal center. Analytical data are in good agreement with the [Cr₃(µ₂-CH₃COO)₆(Î¼₃-O)(CH₃COO) composition.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Analytical Chemistry

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Chromium

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This article has been cited by 1 ACS Journal articles (1 most recent appear below).

Synthesis of Porous CrO_x Pillared Octahedral Layered Manganese Oxide Materials
Ying Ma and Steven L. Suib, Thorsten Ressler and Joe Wong, Mark Lovallo and Michael Tsapatsis
Chemistry of Materials1999 11 (12), 3545-3554
- Synthesis of Porous CrO_x Pillared Octahedral Layered Manganese Oxide Materials
  Ying Ma and Steven L. Suib, Thorsten Ressler and Joe Wong, Mark Lovallo and Michael Tsapatsis
  Chemistry of Materials1999 11 (12), 3545-3554
  Chromium oxide pillared manganese oxide materials were prepared by intercalating layered manganese oxide with chromium hydroxyl acetate clusters under reflux condition. The as-synthesized materials were heated at 200 C in flowing nitrogen for 1 h to ...
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Received: August 03, 2009

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Chromium (III) Acetate, Chromium (III) Acetate Hydroxide, or µ3-Oxo-esakis-(µ2-acetato-O,O') - triaqua-trichromium (III) Acetate? Determining the Structure of a Complex Compound by Analytical and Spectroscopic Methods