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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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© 2013 Michael Paul Docker
Infra red and NMR spectra for A level Chemistry, AQA, CCEA, CIE, Edexcel, IB, OCR, Salters, WJEC, UK, England, Wales, Northern Ireland, International
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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The 1H and 13C NMR spectra on this site have been simulated based on data from the SDBS database.
The Infra Red spectra on this site have been generated from graphical infra red spectra from the SDBS database by vectorising the spectral curves using the DragPotrace application and drawing fresh axes on the spectrum.
The spectra are displayed on an HTML canvas element and additional features (such as structural formulae and spectral assignments) are then superimposed on this canvas.
Further details on the technicalities of linking to and/or displaying the spectra can be found on the FAQ page.
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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The spectra are for compounds that have featured in UK A level examination papers over the last few years.
They show the sorts of feature that A level Chemistry students need to understand and be able to explain.
The raw images from the SDBS database appear to be scans of paper printouts that are not of especially high resolution by modern standards.
By converting the spectral curves from GIF to SVG format and redrawing the axes completely the resulting spectrum can be drawn on any size display and not show the effects of pixellation.
The infra red spectra were vectorised using the DragPotrace application on an Apple Mac computer. DragPotrace is a GUI front end to the Potrace utility.
The raw images from the SDBS database appear to be scans of paper printouts that are not of especially high resolution by modern standards.
By simulating the spectra as vector data and redrawing the axes completely the resulting spectrum can be drawn on any size display and not show the effects of pixellation.
With a simulated spectrum one can more easily home-in on the interesting features rather than having to display the full width spectrum found in the database.
The NMR spectra were simulated by drawing Bezier curves on an HTML canvas that approximate the appearance of the singlet, doublet, triplet and other multiplet features found in NMR spectra. A small amount of random information was added to the height of each peak in the spectrum to make it appear less artificial.
The code numbers are to allow a Chemistry teacher to show a spectrum to their students without immediately giving away the name of the compound being shown.
The idea is to allow the teacher to lead the students through an analysis of the spectrum providing additional information (e.g. molecular formula, structural formula and other clues) at a speed that suits the abilities and experience of the students.
Once the teacher has finished explaining the spectrum, the full assignment can be shown.
The spectra are not actually stored as downloadable images as such, but yes you may "download" them by taking a screenshot of the relevant page.
However, I hope you will find the "live" versions of the spectra useful as well.
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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Visit ChemGym.net for over 100 interactive revision quizzes for A level Chemistry |
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