EPR

Laboratory for Magnetic Resonances

CW-EPR

Marina Ilakovac Kveder

Ph. D. Marina Ilakovac Kveder

+385 1 456 1136
Fax: 01 468 02 45
LMR2018
left right

The main research goal in the LMR is to investigate molecular structure and dynamics in the broad scope of the scientific interest, ranging from the basic problems in the field of solid state physics to soft condensed matter and liquids by using advanced techniques of electron paramagnetic resonance (EPR) spectroscopy.

Laboratory for magnetic resonances in the Division of Physical Chemistry, RBI, is equipped with pulsed EPR spectrometer, FT/CW EPR, ELEXSYS 580, from Bruker, Germany. In  2009, it was upgraded with pulsed electron nuclear double resonance module (pulsed ENDOR) which extends the resolution of the acquired spectra with respect to the neighbor atomic nuclei.

Typical scientific research in LMR (recently published papers) are in areas of phase transitions in soft matter and ferroelectrics studied by EPR relaxation, irradiation damage in organic crystals, EPR/dosimeters, detecting local magnetic field at surface of single molecular magnets and molecular dynamics in synthetic and natural polymers.

EPR (Electron Paramagnetic Resonance or equivalently ESR, Electron Spin Resonance) is a spectroscopic technique capable to detect paramagnetic centers (centers which contain unpaired electron spin). EPR spectroscopy is based on the resonance principle: one detects absorption of microwave radiation when the microwave frequency is equal to the frequency of electron precession in a magnetic field. The extreme sensitivity of EPR spectroscopy allows detection of extremely low concentration of paramagnetic centers/species in a material (less than 1 ppm), a property not usually encountered in other types of spectroscopies.

Since a surprising number of materials exhibit unpaired electrons e.g. in terms of various structural defects at the molecular or atomic level, EPR is applied in physics, chemistry, biology and medicine as well as in interdisciplinary scientific areas. In particular, EPR is applied in studying macromolecules from the synthetic and natural origin, polymers, various biological macromolecules, proteins, membranes etc. Important application of EPR is in ionizing radiation dosimetry and control of the food preserved by ionizing radiation.

Boris Rakvin

+385 1 468 0194
1326 1624

Dalibor Merunka

+385 1 456 1136
1336 1624

Dejana Carić
Ph.D.

Senior professional associate
1805 1624

Dijana Žilić
Ph.D.

Senior Research Associate
Research Associate
+385 1 468 0194
1805 1624

Jurica Jurec
mag. phys.

+385 1 456 1136
1336

Marina Ilakovac Kveder
Ph. D.

senior scientist
+385 1 456 1136
1336 1624

Nadica Maltar Strmečki
PhD

Senior Research Associate
+385 1 456 1127
1327 1624
LMR

1. DESiRe: Low-temperature molecular dynamics of systems exhibiting lattice disorder probed by ESR (HrZZ-1108)

Glavni istraživač / voditelj: Marina Ilakovac Kveder

This project aims to improve the understanding of dynamical properties of disordered systems by fully exploiting the advantage of embedded paramagnetic centres through focusing on their relaxation behaviour, which bears the information about the local frustration of the environment.

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EPR spektrometar

Expired: Molecular structure and dynamics in systems containing paramagnetic particles

Glavni istraživač / voditelj: Boris Rakvin

Project of Ministry of Science, Education and Sports of the Republic of Croatia

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DPPH

Expired: Molecular structure, dynamics and reactivity

Glavni istraživač / voditelj: Boris Rakvin

Program of Ministry of Science, Education and Sports of the Republic of Croatia

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Mn12-acetat

Expired: Project HAZU: Crystals of Organic Stable Radicals as EPR probes on the surface of Single Molecule Magnet Mn12-acetate

Glavni istraživač / voditelj: Dijana Žilić

Support of the Foundation of the Croatian Academy of Sciences and Arts

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Expired: The study of soft condensed matter by EPR: dynamics in glassy and crystalline matrices

Expired: The study of soft condensed matter by EPR: dynamics in glassy and crystalline matrices

Glavni istraživač / voditelj: Marina Ilakovac Kveder

Alexander von Humboldt research group linkage project

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Capital equipment of the Republic of Croatia:

Bruker Elexsys 580 FT/CW EPR spectrometer 

Year: 2002

EPR spectometer Bruker
 

EPR spectrometer Varian E 12

Year: 1981

EPR Spectrometer Varian
 

Spectrofluorimeter Cary Eclipse Varian

Year: 2001

The apparatus allows steady state fluorescence measurements to be performed on liquid samples with a water bath temperature control. The sample volume of  200-3000 μL (1 cm optical path) is appropriate. The experiments are based on fluorescence emission intensity detection including relative quantum yiled and anisotropy in the wavelength region from 200-600 nm.

Spectrofluorimeter
 

Spectrophotometer UV/VIS CARY 50

Year: 2001

The absorbance/transmittance in liquid samples (volume 1000-3000 μL, 1 cm optical path) could be measured at room temperature in the wavelength region from 200-700 nm.

Spectrophotometer
 

Centrifuge Beckman Coulter Allegra X-22R

Year: 2004

This desktop centrifuge operates on smaller speeds. It is possible to use it for concentrating macromolecules in solution, for sedimentaion cells and so on.

Centrifuge

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