PCCE 9/2010

A new generation of paradigms in the molecular magnetism and material sciences. The magnetic anisotropy in complex units, supramolecular systems and at nano-scale

Funded by Romanian CNCS as PCCE9/2010, implemented by six teams from Romanian Universities and Research Institutes.

The magnetic anisotropy in complex units, supramolecular systems and at nano-scale draws a new axis among top subjects of the molecular magnetism, illuminating key factors such as spin coupling, magnetic anisotropy, relaxation and tunneling of magnetization, that govern special properties, like the single molecule and single chain magnet behavior.

Aim

On the ground of recent achievements challenging such paradigms both in experiment (chemical synthesis, materials forging, physical measurements) and theory (quantum models and calculations) one delineates coherently new development areas.
The structure of thematic and participation is interdisciplinary, well tempered in the individual competences and collaboration links.
The central idea stays in the detailed structure-property analysis in coordination spheres with intrinsic anisotropy (f-lanthanide complexes, d-transition metal ions like Mn(iii), Co(ii)) used as new building blocks in d-d, d-f and f-f systems.

The project places on equal footing both the synthetic part, including the rational control of the assembling factors (in coordination, supramolecular or lattice systems) and the theoretical one, revealing the electron structure causalities of spin and orbital couplings, drawing landmarks on the way to engineering of special properties and applicability extensions in spintronics and nanodevices. By the attention devoted to the new case studies provided by the experimental part (coordination compounds and materials), we aim to fill the gaps separating the chemist’s vs physicist’s approaches. The understanding at microscopic and mesoscopic levels the of magnetic anisotropy draws a new generation of problems in the modern magnetism.
The team members have rich expertise, illustrated by series of papers published in journals of high impact, general (JACS, Phys. Rev.) or specialized ones (coordination and theoretical chemistry, magnetism, materials), well perfected in international stages and having active interests in creating infrastructures for applied and academic research.

Objectives

 Synthetic Strategies and Goals:

I.1. The Synthesis and Use of Building d Blocks with Intrinsic Magnetic Anisotropy.

I. 2. The Use of f ions as carriers of Magnetic Anisotropy.

I.3. The use of polynuclear building blocks with Intrinsic ferromagnetic coupling.

I.4. Homo-metallic Chains.

I. 5. Hetero-metallic systems.

I.6. Mixed ligand complexes with special stereochemical features as building blocks for further d-f or d-d supramolecular coupling.

I.7. Syntheses of nanostructured materials, by various conventional and unconventional methods.

Theoretical Aims and Advances:

II.1 Non-standard multiconfiguration and Spin-Orbit ab initio calculations, in d, f units and their oligonuclear systems, using the special strategy of assembling the wavefunctions from those of constituting orbital blocks.

II.2. Numerical and analytical models for Ligand Field, spin coupling and anisotropy, assimilating the regularities revealed from ab initio results, parametrically adjustable to the experimental (magnetic and spectroscopic) data.

II.3 Models and calculations on supramolecular effects using original strategies of assembling large wave functions from subsequently prepared MOs of the constituting fragment.

II.4 Deciphering by computational experiments the mechanisms of the high critical temperature family M[TCNE]xyS (TCNE = tetracyanoethylene, S=solvent).

II.5. Spin Hamiltonian developments

Partners

 

University of Bucharest, Faculty of Chemistry, Inorganic Chemistry Department, Theoretical and Applied Inorganic Chemistry Research Center

 

 Conf. Dr. Marilena Ferbinteanu Cimpoesu
 PhD Stud.Crina Marinescu
 M. Sc. Stud. Andreea Larisa Dinu
 Conf. Dr. Mihaela Badea
 M. Sc. Stud. Alina Zaharia
 
 PhD. Stud. Cristina Bucur
 M. Sc. Stud. Olivia Moga
 

 

 Ovidius University, Faculty of Physics, Chemistry and Petroleum Technology, Interdisciplinary Research Center on Micro- and Nanostructures, Constanta

 

 Prof. Dr. Mihai Girtu
 Ph.D. Stud. Bogdan Frecus
 Lect. dr. Corneliu Oprea
 M. Sc. Stud. Petre Panait
 Dr. Cornel Moscalu
 M. Sc. Stud. Irina Enache

 

 Alexandru Ioan Cuza University of Iasi, Faculty of Physics, Center for Applied Research in Physics and Advanced Technologies, Iasi

 

 Lect. Dr. Cristian Enachescu
 Ph. D. Student Ilie Bodale
 Conf. dr. Laurentiu Stoleriu
 M. Sc. Student Alexandra Dobrinescu
 Asist. dr. Radu Tanasa
 M. Sc. Student Mariana Pavel

 

 Institute of Physical Chemistry I. G. Murgulescu, Romanian Academy, Coordination Chemistry Laboratory, Bucharest

 

 Sc. Res. Fanica Cimpoesu
 Sc. Res. Constanta Spataru
 Sc. Res. Nicolae Stanica
 Sc. Res. Geanina Dobrescu
 Sc. Res. Petre Osiceanu
 

 

 Alexandru Ioan Cuza University of Iasi, Faculty of Chemistry, Physical and Theoretical Chemistry Department, Structure and Theoretical Chemistry Laboratory, Iasi

 

 Conf. Dr. Ionel Humelnicu
 Ph. D. Student Carmen Dascalu
 Conf. dr. Doina Humelnicu
 M. Sc. Student Dumitru Sergentu
 Dr. Dan Maftei
 

 

 National Institute of Materials Physics, Low Temperature Physics and Superconductivity Laboratory, Bucharest

 

 Sc. Res. Petre Badica
 Sc. Res. Stelian Popa
 Sc. Res. Lucica Miu
  Sc. Res. Viorel Constantin Sandu
 Sc. Res. Gheorghe Virgil Aldica
 Ph.D. Student Ion Ivan

 

 

Final Report