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Preparation of nido-Carborane Derivatives: Variation of the 31P{1H} NMR Pattern by Changing the Coordinating Ligand. A Microscale Laboratory

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O. Crespo , M. Concepción Gimeno and Antonio Laguna

Departamento de Química Inorgànica, Universidad de Zaragoza, E-50009 Zaragoza, Spain

J. Chem. Educ., 2000, 77 (1), p 86

DOI: 10.1021/ed077p86

Publication Date (Web): January 1, 2000

Section:

History, Education, and Documentation

Abstract

Nuclear magnetic resonance spectroscopy is a common technique for studying the nature of compounds. Here we present an easy synthesis that illustrates how a slight change of the ligands in a complex can determinate the pattern in the NMR spectrum. We have chosen two o-carborane derivatives because of the growing interest in the applications of such complexes. The stoichiometry of both complexes is the same, [Ag{7,8-(PPh₂)₂-7,8-C₂B₉H₁₀}(PR₃)], where PR₃ is PPh₂Me or PPh₃. When changing from PPh₂Me to PPh₃ the pattern of the ³¹P{¹H} NMR spectrum is modified from an AX₂ system to an AB₂ system, with coupling to the silver nuclei ¹⁰⁹Ag and ¹⁰⁷Ag for both complexes.

Keywords (Audience):

Upper-Division Undergraduate

Keywords (Domain):

Inorganic Chemistry

Keywords (Feature):

The Microscale Laboratory

Keywords (Pedagogy):

Hands-On Learning / Manipulatives

Keywords (Subject):

Microscale Lab

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Combined 31P and 1H NMR Experiments in the Structural Elucidation of Polynuclear Thiolate Complexes
Elena Cerrada and Mariano Laguna
Journal of Chemical Education2005 82 (4), 630
- Combined 31P and 1H NMR Experiments in the Structural Elucidation of Polynuclear Thiolate Complexes
  Elena Cerrada and Mariano Laguna
  Journal of Chemical Education2005 82 (4), 630
  The use of diphosphines such as bis(diphenylphosphine)ethane (dppe) or bis(diphenylphosphine)methane (dppm) with dithiolate gold(I) derivatives induces the isolation of dithiolate gold(I) complexes with two different structures and stoichiometries ...
  Abstract | Hi-Res PDF | PDF w/ Links
Palladium-Catalyzed Heck Reactions of Styrene Derivatives and 2-Iodo-p-carborane
Ludvig Eriksson, Karl Johan Winberg, Rodrigo Tascon Claro, and Stefan Sjöberg
The Journal of Organic Chemistry2003 68 (9), 3569-3573
- Palladium-Catalyzed Heck Reactions of Styrene Derivatives and 2-Iodo-p-carborane
  Ludvig Eriksson, Karl Johan Winberg, Rodrigo Tascon Claro, and Stefan Sjöberg
  The Journal of Organic Chemistry2003 68 (9), 3569-3573
  p-Carborane has been vinylated on the 2-B-atom in high yields using the Heck reaction. Thus, the reaction between 2-iodo-p-carborane and various styrenes [4-H-, 4-C6H4-, 4-Cl-, 4-Br-, 4-NO2-, 4-CH3O-, and 4-CH3-] resulted in the production of the ...
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