A series of cyanide bridged Fe-Co molecular squares, [Co(2)Fe(2)(CN)(6)(tp*)(2)(dtbbpy)(4)](PF(6))(2)·2MeOH (1), [Co(2)Fe(2)(CN)(6)(tp*)(2)(bpy)(4)](PF(6))(2)·2MeOH (2), and [Co(2)Fe(2)(CN)(6)(tp)(2)(dtbbpy)(4)](PF(6))(2)·4H(2)O (3) (tp = hydrotris(pyrazol-1-yl)borate, tp* hydrotris(3,5-dimethylpyrazol-1-yl)borate, bpy =2,2'-bipyridine, dtbbpy =4,4'-di-tert-butyl-2,2'-bipyridine), were prepared by the reactions [Fe(CN)(3)(L)](-) (L tp or tp*) with Co(2+) bidentate ligands (bpy dtbbpy) in...

Photo-switchable systems, such as discrete spin-crossover complexes and bulk iron–cobalt Prussian blue analogues, exhibit, at a given temperature, bistability between low- high-spin states, allowing the storage of binary data. Grouping different bistable chromophores in molecular framework was postulated to generate complex that could be site-selectively excited access multiple electronic states under identical conditions. Here we report synthesis thermal light-induced phase transitions...

Spinning out: A cyanide-bridged molecular square (see picture) has been isolated and found to undergo thermally induced, two-step spin crossover. Molecules with more than one spin-crossover site are suitable building blocks for multistepped switches. Supporting information this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2005/z502216_s.pdf or from author. Please note: The publisher not responsible content functionality of any supporting supplied by authors....

Tetranuclear Fe(II) cubic complexes were synthesized with Schiff base ligands bridging the centers. X-ray structural analyses of six ferrous cubes, [Fe4(sap)4(MeOH)4].2H2O (1), [Fe4(5-Br-sap)4(MeOH)4] (2), [Fe4(3-MeO-sap)4(MeOH)4].2MeOH (3), [Fe4(sae)4(MeOH)4] (4), [Fe4(5-Br-sae)4(MeOH)4].MeOH (5), and [Fe4(3,5-Cl2-sae)4(MeOH)4] (6) (R-sap R-sae prepared by condensation salicylaldehyde derivatives aminopropyl alcohol aminoethyl alcohol, respectively) performed, their magnetic properties...

An iron(II) complex with ferrocenyl groups, [Fe(dppFc)2](BF4)2·2Et2O (1·2Et2O, dppFc = 1-ferrocenyl-2-{(2,6-bis(pyrazolyl)pyridyl}ethylene), was prepared. X-ray crystallographic analyses revealed that 1·2Et2O underwent a single-crystal-to-single-crystal transformation the release of crystal solvent molecules. In magnetic susceptibility measurements, reversible conversion between paramagnetism and spin-crossover induced by molecules observed.

The multicomponent system of [Fe(dpp)2][Ni(mnt)2]2·MeNO2 (1; dpp = 2,6-bis(pyrazol-1-yl)pyridine and mnt maleonitriledithiolate) was prepared by the reaction [Fe(dpp)2](BF4)2 with (Bu4N)[Ni(mnt)2] in MeNO2. Variable-temperature X-ray structural analyses, magnetic susceptibility, heat capacity measurements confirmed that 1 undergoes multiple spin-state conversions both cationic anionic components. asymmetric unit crystal contains one [Fe(dpp)2]2+ cation, two [Ni(mnt)2]− anions ([Ni1]−...

Single-molecule magnets: A cyanide-bridged hexanuclear complex showed a thermal electron-transfer-coupled spin transition centered at 220 K. Light irradiation low temperature (LT; HT = high temperature) generated metastable state showing slow magnetic relaxation in measurements of the alternating-current susceptibility (χ(m); see picture).

Abstract Cyanide‐bridged molecular squares offer a unique opportunity for study, as they represent model of the simplest unit Prussian blue and allow access to wide range physical properties that can be monitored, such rich electrochemistry, valence‐ spin‐state control, spin‐crossover phenomena. This microreview presents recent findings in field cyanide with particular focus on their syntheses properties.

Abstract Co‐crystallization of a cyanide‐bridged tetranuclear complex [Co 2 Fe ] with 4‐cyanophenol (CP) gave hydrogen bonding donor–acceptor system, (bpy*) 4 (CN) 6 (tp*) ](PF ) ⋅2 CP⋅8 BN ( 1 ). exhibited three‐step phase transition between HT, IM1, IM2, and LT phases upon temperature variation. Variable magnetic measurements structural analyses revealed that the spin is caused by electron‐transfer‐coupled transitions (ETCSTs) accompanied alteration interactions.

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSuperparamagnetic Behavior in an Alkoxo-Bridged Iron(II) CubeHiroki Oshio, Norihisa Hoshino, and Tasuku ItoView Author Information Department of Chemistry, Graduate School Science Tohoku University, Aoba-ku, Sendai 980-8578, Japan Cite this: J. Am. Chem. Soc. 2000, 122, 50, 12602–12603Publication Date (Web):December 2, 2000Publication History Received4 August 2000Published online2 December inissue 1...

Abstract High‐spin molecules with easy‐axis magnetic anisotropy show slow relaxation of spin‐flipping along the axis and are called single‐molecule magnets (SMMs). SMMs behave as molecular‐size permanent at low temperature occurs by quantum tunneling processes; such promising candidates for use in devices. We first discuss intramolecular ferromagnetic interactions preparing high‐spin molecules. Second, we determine single metal ions d n configurations how molecular arises from single‐ion...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign of a homonuclear ferromagnetic chain: structures and magnetic properties oxalato-bridged copper(II) complexes with one-dimensional structuresHiroki Oshio Umpei NagashimaCite this: Inorg. Chem. 1992, 31, 15, 3295–3301Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://doi.org/10.1021/ic00041a025Request reuse permissionsArticle Views418Altmetric-Citations122LEARN ABOUT THESE...

The tetranuclear complex [MnIII2NiII2Cl2(salpa)2] (salpa = N-(2-hydroxybenzyl)-3-amino-1-propanol) has a spin ground state of S 6 and was confirmed to be an SMM based on steplike feature the magnetization hysteresis loop at 0.55 K.

Iron(II) complexes with neutral and oxidized tetrathiafulvalene (TTF) moieties were prepared X-ray crystallographic analyses, magnetic electrical resistivity measurements suggested an interaction of spin transition conductivity.

Magnetic switch: An iron(II) complex with a diarylethene moiety was synthesized and its magnetic properties were investigated. The exhibited four unique electronic states based on high- low-spin iron(II), as well open- closed-forms of the (see scheme). showed switchable spin light-induced excited-spin-state trapping in solid state, through photocyclization reactions butyronitrile. As service to our authors readers, this journal provides supporting information supplied by authors. Such...

We report three self-assembled iron complexes that comprised an anti-parallel open form (o-Lanti ), a parallel (o-Lsyn and closed (c-L) of diarylethene conformers. Under kinetic control, FeII2 )3 was isolated, which exhibited dinuclear structure with diamagnetic properties. light-irradiation (c-L)3 prepared paramagnetism spin-crossover behaviour. thermodynamic control in the presence indispensable [FeIII (Tp*)(CN)3 ]- , transformed into tetranuclear FeIII2 )2 complete behaviour at T1/2 =353 K.

Magnetism of a complex [Fe(H2Bpz2)2(bipy-NH2)] (H2Bpz2 = dihydrobis(1-pyrazolyl)borate, bipy-NH2 4,4′-diamino-2,2′-bipyridine) has been altered from paramagnetic to spin-crossover (SCO) behavior, through protonation one amino group with CF3SO3H. Complete SCO transition, both in solid state and solution, occurs at ambient temperature.

Abstract A mononuclear Fe II complex, prepared with a Brønsted diacid ligand, H 2 L (H L=2‐[5‐phenyl‐1 ‐pyrazole‐3‐yl] 6‐benzimidazole pyridine), shows switchable physical properties and was isolated in five different electronic states. The spin crossover (SCO) [Fe L) ](BF 4 ) ( 1 ), exhibits abrupt transition at T 1/2 =258 K, treatment base yields deprotonated analogue (HL) ] B which gradual SCO above 350 K. range of III analogues were also characterized. (HL)(H L)](BF )Cl C has an S =5/2...

Molecular materials possessing photo-tunable polarization switching is promising for optical switches, smart sensors, and data storage devices. However, it challenging to devise a molecular material featuring simultaneous switchable magnetic dielectric properties with regard non-invasive convenient light stimulus. Herein, we report new Hofmann-type metal-organic framework (MOF) {Fe(bpt)[Pt(CN)4 ]} ⋅ 0.5anth (1, bpt=2,5-bis(4-pyridyl)thiophen; anth=anthracene), which displays thermo-...