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This review reports on the study of the interplay between magnetic coupling and spin transition in 2,2′-bipyrimidine (bpym)-bridged iron(II) dinuclear compounds. The coexistence of both phenomena has been observed in {[Fe(bpym)(NCS)2]2(bpym)}, {[Fe(bpym)(NCSe)2]2(bpym)} and {[Fe(bt)(NCS)2]2(bpym)} (bpym=2,2′-bipyrimidine, bt=2,2′-bithiazoline) by the action of external physical perturbations such...
Mössbauer spectroscopy is a profound analytical method which has nevertheless continued to develop. The authors now present a state-of-the art book which consists of two parts. The first part details the fundamentals of Mössbauer spectroscopy and is based on a book published in 1978 in the Springer series 'Inorganic Chemistry Concepts' by P. Gütlich, R. Link and A.X. Trautwein. The second part covers...
Thermal spin transition (spin crossover), one of the most fascinating dynamic electronic structure phenomena occurring in coordination compounds of third row transition metal ions, mostly of iron(II), iron(III) and cobalt(II) with critical ligand field strengths competing with the spin pairing energy, has attracted increasing attention by many research groups. One of the reasons is the promising potential...
This review reports on the study of the interplay between magnetic coupling and spin transition in 2,2′-bipyrimidine (bpym)-bridged iron(II) dinuclear compounds. The coexistence of both phenomena has been observed in {[Fe(bpym)(NCS)2]2(bpym)}, {[Fe(bpym)(NCSe)2]2(bpym)} and {[Fe(bt)(NCS)2]2(bpym)} (bpym=2,2′-bipyrimidine, bt=2,2′-bithiazoline) by the action of external physical perturbations such...
This chapter considers thermal spin crossover occurring in transition metal compounds other than those of Fe(II), Fe(III) and Co(II). Unusual magnetic properties of several coordination and organometallic complexes of Mn(II), Mn(III), Cr(II) and Co(III) are discussed in the light of their structural features.
The results of X-ray diffraction studies of spin crossover complexes of iron(II) with R=1-propyl- (ptz), 1- methyl- (mtz) and 1-ethyltetrazole (etz) ligands, [Fe(Rtz)6](BF4)2, as a function of temperature (down to 10 K) and after light-induced conversion to long-lived metastable spin states (LIESST) are reviewed. Not only has the most prominent member of this class of spin crossover compounds, viz...
Thermal spin transition (spin crossover), one of the most fascinating dynamic electronic structure phenomena occurring in coordination compounds of third row transition metal ions, mostly of iron(II), iron(III) and cobalt(II) with critical ligand field strengths competing with the spin pairing energy, has attracted increasing attention by many research groups. One of the reasons is the promising potential...
In this chapter an outline is presented of the principal features of electronic spin crossover. The development of the subject is traced and the various modes of manifestation of spin transitions are presented. The role of cooperativity in influencing solid state behaviour is considered and the various strategies to strengthen it are addressed along with the chemical and physical perturbations which...
Mössbauer Emission Spectroscopy (MES) has been employed in studies of chemical and physical after-effects of the electron capture process 57Co(EC)57Fe in inorganic compounds. The 57Co labelled compounds are used as the Mössbauer source at variable temperatures vs a single-line absorber such as K4[Fe(CN)6]·3H2O kept at room temperature. The recorded ME spectrum yields information on the electronic...
Mössbauer Emission Spectroscopy (MES) has been employed in studies of chemical and physical after-effects of the electron capture process 57Co(EC)57Fe in inorganic compounds. The 57Co labelled compounds are used as the Mössbauer source at variable temperatures vs a single-line absorber such as K4[Fe(CN)6]·3H2O kept at room temperature. The recorded ME spectrum yields information on the electronic...
This chapter considers thermal spin crossover occurring in transition metal compounds other than those of Fe(II), Fe(III) and Co(II). Unusual magnetic properties of several coordination and organometallic complexes of Mn(II), Mn(III), Cr(II) and Co(III) are discussed in the light of their structural features.
The results of X-ray diffraction studies of spin crossover complexes of iron(II) with R=1-propyl- (ptz), 1- methyl- (mtz) and 1-ethyltetrazole (etz) ligands, [Fe(Rtz)6](BF4)2, as a function of temperature (down to 10 K) and after light-induced conversion to long-lived metastable spin states (LIESST) are reviewed. Not only has the most prominent member of this class of spin crossover compounds, viz...
In this chapter an outline is presented of the principal features of electronic spin crossover. The development of the subject is traced and the various modes of manifestation of spin transitions are presented. The role of cooperativity in influencing solid state behaviour is considered and the various strategies to strengthen it are addressed along with the chemical and physical perturbations which...
In the present review chapter we discuss the results of investigations of the influence of hydrostatic pressure (up to 1.2 GPa) on the spin transition behaviour in coordination compounds of 3d transition metal ions. The systems under investigation are mononuclear spin crossover compounds of iron(II) and chromium(II), dinuclear complexes of iron(II) exhibiting coexistence of intramolecular antiferromagnetic...
In the present review chapter we discuss the results of investigations of the influence of hydrostatic pressure (up to 1.2 GPa) on the spin transition behaviour in coordination compounds of 3d transition metal ions. The systems under investigation are mononuclear spin crossover compounds of iron(II) and chromium(II), dinuclear complexes of iron(II) exhibiting coexistence of intramolecular antiferromagnetic...
We have learned from the preceding chapters that the chemical and physical state of a Mössbauer atom in any kind of solid material can be characterized by way of the hyperfine interactions which manifest themselves in the Mössbauer spectrum by the isomer shift and, where relevant, electric quadrupole and/or magnetic dipole splitting of the resonance lines. On the basis of all the parameters obtainable...
In Chap. 2, for the sake of simplicity, we dealt with transitions between unperturbed energy levels of “bare” nuclei with the mean transition energy E0. In reality, however, nuclei are exposed to electric and magnetic fields created by the electrons of the Mössbauer atom itself and by other atoms in the neighborhood. These fields generally interact with the electric charge distribution...
Conventional Mössbauer spectroscopy (MS) can be considered as “spectroscopy in the energy domain.” It has been widely used since its discovery in 1958 [1]. Nuclear resonant forward scattering (NFS) of synchrotron radiation has been successfully employed as a time-differential technique since 1991 [2]. Another related technique, nuclear inelastic scattering (NIS) of synchrotron radiation [3], can be...
The previous chapters are exclusively devoted to the measurements and interpretation of 57Fe spectra of various iron-containing systems. Iron is, by far, the most extensively explored element in the field of chemistry compared with all other Mössbauer-active elements because the Mössbauer effect of 57Fe is very easy to observe and the spectra are, in general, well resolved and they reflect important...
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