Reversible quintet-singlet transition in dithiocyanato-bis(2,2'-dipyridyl)iron(II)

Koenig, E.; Madeja, K.; Watson, K. J.

doi:10.1021/ja01007a010

Cited by 145 publications

(50 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…18 In Fig. 2, values of I1EQ calculated according to (2) are plotted as functions of the axial field splitting 8 for the temperatures of 4.2, 77, 196, 244, and 29S o K. Covalency effects were ignored except that the spinorbit coupling constant r was reduced from its free ion value of 400 to 320 cm-I • The maximum theoretical value of I1E Q is (2/7)e 2 Q'(r- 3 ), and this was equated to 4.0 mm secI, which gives viz., 3.81 to 3.90 mm secI, dependent on the temperature, for a hydrotris( I-pyrazolyl) borate chelate. lO The tlEQ values which were observed for the compounds studied here (d. Table I) Table II.…”

Section: Xq= [E 2 Q'(r-3 )/7i(2i -1) ]mentioning

confidence: 99%

Slow Electronic Relaxation in T52−A11 Spin Equilibria of Tris(2-methyl-1,10-phenanthroline)Iron(II) Complexes: A Mössbauer Effect Study

König

Ritter

Spiering

et al. 1972

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

Articles you may be interested inThe effect of pressure on the thermal hysteresis of the firstorder spin transition in bis(1,10 phenanthroline2carbaldehyde phenylhydrazone) iron (II) complexes J. Chem. Phys. 83, 3055 (1985); 10.1063/1.449209 Electron Transfer Rates for Unsubstituted and Dimethylsubstituted Tris(1,10phenanthroline) Iron(II) and (III) Ions from NMR Studies Erratum: Nuclear Magnetic Resonance Studies of Electron Transfer between Tris(2,2′ dipyridyl)osmium(II) and (III) Ions, between Bis(cyclopentadienyl)iron(II) and (III) Ion, and between Tris(1,10phenanthroline)iron(II) and (III) Ions Nuclear Magnetic Resonance Studies of Electron Transfer between Tris (2,2′dipyridyl) osmium (II) and (III) Ions, between Bis(cyclopentadienyl)iron(II) and (III) Ions, and between Tris(1,10 phenanthroline)iron(II) and (III) IonsThe 57Fe Mossbauer effect in [FeL3](CI04). (I) and [FeL3](BF4). (II) ~a~ been studied betwe.en 2~5 and 4.2°K (L=2-methyl-1, lO-phenanthroline). At 295°K, compound I exhibits a quadrupole split pair of lines characteristic of a 5T, ground state, !1EQ(5T,) = 1.03 mm sec-I and 8IBo(5T,) = +0.9.5 m.m sec~l. At 244°K, line broadening is observed. At even lower temperatures, e.g., at 196 K, the relative Intensity of the doublet has decreased and a second doublet typical of a IAI ground state has appeared. At 4.2°K, 72.7% of the intensity is due to IA I , !1EQ(IA I) =0.57 mm secl, and 8 IB (IAI) =0.?8 mm S~C-I. Similar behavior is encountered in II. The observations are accounted for by slow electronIc relaxatIOn between 6T, and lAI in the temperature range between 230 and 120 0 K and the assumpt!on of permanently ~ar~mag netic molecules which become apparent below nOK. A change of the relaxatIOn at about 244 K IS likely. From the temperature dependence of !1EQ(6T,), the axial field splitting is 8=-640 cm-1 in I and?= -58~ cm-~ in II. In conjunction with magneti~ data it is demons~rated t~at.the 5T2-111 ~ner~ separatIOn 8 vanes with temperature: 8=300 cm-1 at 294 K and 8=990 cm I at 9~ K In I and Similarly In II. In an applied field of 50 kG, the sign of V" is positive for the lAI component In both I and II.

show abstract

Section: Xq= [E 2 Q'(r-3 )/7i(2i -1) ]mentioning

confidence: 99%

Slow Electronic Relaxation in T52−A11 Spin Equilibria of Tris(2-methyl-1,10-phenanthroline)Iron(II) Complexes: A Mössbauer Effect Study

König

Ritter

Spiering

et al. 1972

The Journal of Chemical Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…[18][19][20][21][22][23][24][25] The thiocyanate groups can be arranged in trans or cis configuration; however more SCO compounds with cis arrangement have been described. [21,[26][27][28] Examples for this configuration are the well-known complexes [Fe(phen) 2 (NCS) 2 ] [29] and [Fe(bipy) 2 (NCS) 2 ] [30] (phen = 1,10-phenanthroline, bipy = 2,2Ј-bipyridine).…”

Section: Introductionmentioning

confidence: 99%

Iron(II) Complexes Supported by a Tetradentate Ligand Providing a Strained Equatorial Coordination Environment: Geometric and Electronic‐Structural Implications

Schmidt

Kisslinger

Würtele

et al. 2013

Zeitschrift anorg allge chemie

View full text Add to dashboard Cite

“…However, the unexpected synthesis of three different crystalline phases of 1, [Fe(cddt)(NCS) 2 [20,21] The majority of reports of polymorphism have been in mononuclear iron(II) species, [22][23][24][25][26] in particular, the compounds [cis-Fe(phen) 2 (NCS) 2 ] [22] and [cis-Fe(bipy) 2 -(NCS) 2 ] [23] (phen = 1,10-phenanthroline, bipy = 2,2-bipyridyine) exist as polymorphs and have received a large amount of interest over many years. More recently, the material [Fe(dppa) 2 (NCS) 2 ] [dppa = (3-aminopropyl)bis(pyrid-2-ylmethyl)amine] was reported [25] which forms as three crystallographically distinct polymorphs; A: triclinic, B: monoclinic and C: orthorhombic.…”

Section: Introductionmentioning

confidence: 99%

Spin‐Crossover Studies on a Series of 1D Chain and Dinuclear Iron(II) Triazine‐Dipyridylamine Compounds

et al. 2007

View full text Add to dashboard Cite

Keywords: Iron / N ligands / Spin crossover / 1D chains / Dinuclear / Magnetic properties Four isostructural one-dimensional polymeric iron(II) spin crossover materials containing the ligand 2-chloro-4,6-bis(dipyrid-2-ylamino)-1,3,5-triazine (cddt) have been synthesised and magnetically and structurally characterised. The polymeric material Fe(NCS) 2 (cddt)·n(guest) (1), self assembles into three crystallographically distinct phases; the compounds 1b and 1c, [Fe(NCS) 2 (cddt)]·2(CH 3 OH), are polymorphs, however, 1a, [Fe(NCS) 2 (cddt)]·1/2(CHCl 3 )·(H 2 O) contains a different solvent system. Each phase shows very different magnetic behaviour; phases 1a and 1b remain high spin over all temperatures, whilst phase 1c undergoes a "half" spin crossover between 225 and 125 K. The structural consequences of the spin transition in 1c have been followed using variable temperature synchrotron powder X-ray diffraction techniques. Variation of the chalcogenide ligand in the complex [Fe(NCSe) 2 (cddt)]·2(CH 3 OH), 2, leads to a full one-step spin crossover with a T 1/2 of 200 K. Structural analy-

show abstract

Reversible quintet-singlet transition in dithiocyanato-bis(2,2'-dipyridyl)iron(II)

Cited by 145 publications

References 0 publications

Slow Electronic Relaxation in T52−A11 Spin Equilibria of Tris(2-methyl-1,10-phenanthroline)Iron(II) Complexes: A Mössbauer Effect Study

Slow Electronic Relaxation in T52−A11 Spin Equilibria of Tris(2-methyl-1,10-phenanthroline)Iron(II) Complexes: A Mössbauer Effect Study

Iron(II) Complexes Supported by a Tetradentate Ligand Providing a Strained Equatorial Coordination Environment: Geometric and Electronic‐Structural Implications

Spin‐Crossover Studies on a Series of 1D Chain and Dinuclear Iron(II) Triazine‐Dipyridylamine Compounds

Contact Info

Product

Resources

About