Choose another division
Electrical semiconductor characterization
Luminescence dating, research, dosimetry and more
Free radical measurements in life science and biomedical applications
Our benchtop MiniScope (MS 5000) ESR spectrometer is a research grade device with sensitivity and reliability for demanding...
Industry standard for evaluating irradiation doses on alanine tablets
Nitric oxide measurement, reactive oxygen species, oxidative stress, radical generating systems, photo dynamic therapy
Antioxidative features of foodstuff, radicals on foodstuff, radiation-induced radicals
Analysis of chemical structure of paramagnetic centers and their orientation within a crystal
Bioinorganic transition metal compounds, fenton chemistry, effect of heavy metal ions on livving tissue
Variety of free radicals in environmental applications can be evaluated by EPR spectroscopy
ESRStudio is a dynamic and user friendly software for ESR measurements with some of the most modern and fluent workflow based...
Magnettech GmbH was founded in 1991 by the members of the department of "Centre for Construction of Scientific Devices"...
For Sales, Technical Support, Service and other General Enquiries
Many but not all transition metal ions are bearing unpaired electrons. The ones with unpaired electrons are ESR-detectable by Magnettech's MS5000 due to the high sensitivity of the ESR spectrometer.
In many cases still the detection provides information about the ligand field (high spin or low spin) or the oxidation state of the ion.
For example an ESR-silent complex of Fe2+ possesses a d6-low spin electron configuration, were all electrons are paired. An Fe2+ complex showing an ESR spectrum has a high spin configuration. As Fe2+ low spin, Cu+ is also ESR silent, because of its d10-configuration, where all d-orbitals are fully occupied and all d-electrons are paired. In contrast Cu2+ bears one unpaired electron resulting in an one line spectrum.
Beside the miniscope ESR spectrometer provides an ideal tool to compare the coordination geometry of active metal centres of enzymes and their low molecular weight model complexes by using the state of the art miniscope evaluation software. An example is shown below, displaying the ESR-spectra of the active Cu2+ centre of Cu(II)2Zn2 superoxide dismutase and Cu(II)PuPy a superoxide dismutase mimic.
Usage of the temperature controller for MS5000 allows to record spectra at liquid nitrogen temperature in frozen solutions of ethyleneglycol : water 1:1. The hyperfine splitting of these anisotropic signals provide information if the coordination geometry is tetragonal planar or tetrahedrally distorted.
Most of the enzymes and model complexes examined are copper and iron bearing compounds. But electron spin resonance (ESR) spectroscopy is useful for all paramagnetic transition metal centres with unpaired electrons in general.