Spin Crossover Studies on Bis{hydro‐tris(1,2,4‐triazolyl)borato}iron(II)

Janiak, Christoph; Scharmann, Tobias G.; Bräuniger, Thomas; Holubová, Jana; Nádvornı́k, Milan

doi:10.1002/(sici)1521-3749(199805)624:5<769::aid-zaac769>3.0.co;2-#

Cited by 41 publications

(10 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Depending on the nature of the substituted 1,2,4-triazole ligand and the presence of potentially coordinating water molecules, the spin crossover materials may be linear trinuclear [23], linear polynuclear or even tridimensional [4]. The only mononuclear Fe(II) compound containing a hexakis(N1-1,2,4-triazole)iron(II) chromophore is bis[hydrotris(1,2,4-triazol-1-yl)borate]iron(II) [17][18][19][20][21].…”

Section: Discussionmentioning

confidence: 99%

“…, has been studied more recently [17][18][19][20][21]. This is the only mononuclear Fe(II) spin transition compound containing six N-1-donating 1,2,4-triazole nuclei.…”

Section: Linear Polynuclear Fe(ii) Spin Crossover Compoundsmentioning

confidence: 99%

“…The dehydrated derivative [Fe{HB(C 2 H 2 N 3 ) 3 } 2 ] has been reported to exhibit a very abrupt spin transition between 334-345 K via variable temperature UV-vis and 57 Fe Mössbauer spectroscopy studies [19]. After the publication of a preliminary magnetic study in 1994 [19], a more detailed report appeared in 1998 [20]. The coordination properties of two other classes of tridentate chelating 1,2,4-triazole-containing-ligands have been studied by Goodwin et al [14][15][16].…”

Section: Linear Polynuclear Fe(ii) Spin Crossover Compoundsmentioning

confidence: 99%

“…The N-4 coordination towards Fe(II) has been found in mononuclear Fe(II) spin crossover compounds containing bidentate 1,2,4-triazole ligands [10][11][12][13], as well as tridentate ligands bearing no substituent at N-4 of the 1,2,4-triazole ring [14][15][16]. The only exception known is the mononuclear Fe(II) spin crossover compound of the tridentate hydrotris(1,2,4-triazol-1yl)borate [17][18][19][20][21], where coordination is through N-1 rather than N-4. This probably occurs because of the resulting favourable geometry of the chelate rings.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Special Classes of Iron(II) Azole Spin Crossover Compounds

Koningsbruggen

2004

Topics in Current Chemistry

View full text Add to dashboard Cite

In this chapter, selected results obtained so far on Fe(II) spin crossover compounds of 1,2,4-triazole, isoxazole and tetrazole derivatives are summarized and analysed. These materials include the only compounds known to have Fe(II)N 6 spin crossover chromophores consisting of six chemically identical heterocyclic ligands. Particular attention is paid to the coordination modes for substituted 1,2,4-triazole derivatives towards Fe(II) resulting in polynuclear and mononuclear compounds exhibiting Fe(II) spin transitions. Furthermore, the physical properties of mononuclear Fe(II) isoxazole and 1alkyl-tetrazole compounds are discussed in relation to their structures. It will also be shown that the use of a,b-and a,w-bis(tetrazol-1-yl)alkane type ligands allowed a novel strategy towards obtaining polynuclear Fe(II) spin crossover materials.

show abstract

Section: Discussionmentioning

confidence: 99%

“…, has been studied more recently [17][18][19][20][21]. This is the only mononuclear Fe(II) spin transition compound containing six N-1-donating 1,2,4-triazole nuclei.…”

Section: Linear Polynuclear Fe(ii) Spin Crossover Compoundsmentioning

confidence: 99%

Section: Linear Polynuclear Fe(ii) Spin Crossover Compoundsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Special Classes of Iron(II) Azole Spin Crossover Compounds

Koningsbruggen

2004

Topics in Current Chemistry

View full text Add to dashboard Cite

show abstract

“…Proton NMR measurements (Evans method) have been carried out to follow a temperature-dependent ST phenomenon in solution [82,112–117]. The paramagnetic peak changes position with varying temperature relative to a standard reference signal, which in favorable cases can be part of the SCO compound (e.g., the anion) [113–118], and this reflects the ST process. In studies of the solid state, however, the NMR spectrum of SCO compounds has been of little value.…”

Section: Reviewmentioning

confidence: 99%

Spin state switching in iron coordination compounds

Gütlich¹,

Gaspar²,

Garcia³

2013

Beilstein J. Org. Chem.

661

608

View full text Add to dashboard Cite

SummaryThe article deals with coordination compounds of iron(II) that may exhibit thermally induced spin transition, known as spin crossover, depending on the nature of the coordinating ligand sphere. Spin transition in such compounds also occurs under pressure and irradiation with light. The spin states involved have different magnetic and optical properties suitable for their detection and characterization. Spin crossover compounds, though known for more than eight decades, have become most attractive in recent years and are extensively studied by chemists and physicists. The switching properties make such materials potential candidates for practical applications in thermal and pressure sensors as well as optical devices.The article begins with a brief description of the principle of molecular spin state switching using simple concepts of ligand field theory. Conditions to be fulfilled in order to observe spin crossover will be explained and general remarks regarding the chemical nature that is important for the occurrence of spin crossover will be made. A subsequent section describes the molecular consequences of spin crossover and the variety of physical techniques usually applied for their characterization. The effects of light irradiation (LIESST) and application of pressure are subjects of two separate sections. The major part of this account concentrates on selected spin crossover compounds of iron(II), with particular emphasis on the chemical and physical influences on the spin crossover behavior. The vast variety of compounds exhibiting this fascinating switching phenomenon encompasses mono-, oligo- and polynuclear iron(II) complexes and cages, polymeric 1D, 2D and 3D systems, nanomaterials, and polyfunctional materials that combine spin crossover with another physical or chemical property.

show abstract

Modified Bipyridines: 5,5′-Diamino-2,2′-bipyridine Metal Complexes Assembled into Multidimensional Networks via Hydrogen Bonding and π–π Stacking Interactions

Janiak

Deblon

et al. 1999

Eur. J. Inorg. Chem.

Self Cite

View full text Add to dashboard Cite

A new synthetic route for the synthesis of 5,5′‐diamino‐2,2‐bipyridine (5) based on the coupling of 2‐chloro‐5‐aminopyridine in the presence of NiCl2 × 6 H2O/PPh3/Zn in dimethylformamide is described. The reactions of the potentially ambidentate ligand 5 with salts of the transition metals Mn, Fe, Ni, Cu, Zn, Ag, and Cd gave a variety of 13 metal–ligand complexes depending on the anion, the crystallization conditions and the metal‐to‐ligand ratio. The complexes obtained were characterized by thermal analyses, NMR including 113Cd‐NMR, IR, and for the iron complex 57Fe‐Mößbauer spectroscopy. The structure of eight of the compounds was elucidated by X‐ray crystallography. All of these metal complexes show a bipyridine–metal coordination. The amino functionality was never involved in metal coordination. The intermolecular arrangement is dictated by hydrogen bonding from the amino functionality and by π–π stacking of the bipyridine rings.

show abstract

Spin Crossover Studies on Bis{hydro‐tris(1,2,4‐triazolyl)borato}iron(II)

Cited by 41 publications

References 10 publications

Special Classes of Iron(II) Azole Spin Crossover Compounds

Special Classes of Iron(II) Azole Spin Crossover Compounds

Spin state switching in iron coordination compounds

Modified Bipyridines: 5,5′-Diamino-2,2′-bipyridine Metal Complexes Assembled into Multidimensional Networks via Hydrogen Bonding and π–π Stacking Interactions

Contact Info

Product

Resources

About