- Chiral control of spin-crossover dynamics in Fe(II) complexes.
- Spin crossover in cis manganese(III) quinolylsalicylaldiminates.
- Spin Crossover Behavior in a Homologous Series of Iron(II) Complexes.
- Spin crossover ligands.
- Iron(III) Spin Crossover Compounds | SpringerLink.
- PDF Spin Crossover in New Iron(II) Coordination Compounds with Tris... - MDPI.
- Spin-Transition Polymers: From Molecular Materials Toward... - Science.
- Spin-Crossover Complexes - Chemistry Europe.
- Spin-Crossover Materials - Wiley Online Library.
- Spin states (d electrons) - Wikipedia.
- Amphiphilic Spin Crossover Complexes - EPub Bayreuth.
- Iron(III) spin crossover compounds — Aston Research Explorer.
- (PDF) Spin-Crossover Complexes.
Chiral control of spin-crossover dynamics in Fe(II) complexes.
Abstract. LIESST iron (II) spin-crossover mononuclear complex [Fe (L) (CN) 2 ]·H 2 O (1) (L is Schiff-base macrocylic ligand derived from the condensation of 2,6-diacetylpyridine with 3,6-dioxaoctane-1,8- diamine) with macro ring and two CN - bridging ligands in complex 1 can coordinate to other metal compounds, it is possible to build one.
Spin crossover in cis manganese(III) quinolylsalicylaldiminates.
. In this contribution, new N-confused C-scorpionate ligands are prepared with two 'normal' pz* groups ( = 3,5-dimethylpyrazol-1yl) and a 'confused' pyrazolyl with either an N-H, HL*, or an N-Tosyl (Tosyl = p-toluenesulfonyl), TsL*, bound to a central methine.... Spin Crossover Behavior of N-Confused C-Scorpionate Complexes of Iron(II. Jun 01, 2012 · Both 1 and 2 exhibit a low spin (S = 1/2) to high spin (HS, S = 5/2) transition in the solid state. In solution at room temperature both complexes are predominantly HS. Upon exposure to 310 (trans cis) and 440 nm radiation (cis trans) the free and coordinated 3- and 4-azpy ligands undergo a reversible cis–trans isomerization.
Spin Crossover Behavior in a Homologous Series of Iron(II) Complexes.
Magnetic measurements reveal that complexes 1 and 2 exhibit different thermal spin-crossover behavior. Complex 1 shows a crystalline solvent effect on spin crossover (SCO). After desorption of the crystalline solvent by heating, an abrupt one-step transition with a hysteresis loop was observed for the desolvated form 1′.
Spin crossover ligands.
Low-spin (S = 0) states with light (i.e. the LIESST effect) 19,20,21 or heat makes spin-crossover complexes attractive targets for applications in memory, displays, sensors, and, most relevantly, switches.22 Combining spin-crossover phenomena with appropriate organic ligands is therefore a compelling strategy for generating switchable diradicals.
Iron(III) Spin Crossover Compounds | SpringerLink.
Feb 11, 2020 · The dimeric motif is the smallest unit for two interacting spin centers allowing for systematic investigations of cooperative interactions. As spin transition compounds, dinuclear complexes are of particular interest, since they potentially reveal a two-step spin crossover (SCO), switching between the high spin–high spin [HS-HS], the high spin–low spin [HS-LS], and the low spin–low spin.
PDF Spin Crossover in New Iron(II) Coordination Compounds with Tris... - MDPI.
Herein, synthesis and characterization of the spin-crossover and valence tautomeric cobalt dioxolene complexes are reported. All the synthesized complexes contain N,N'-di-tert-butyl-2,11-diaza[3.3](2,6)pyridinophane (L-N4tBu2) as ancillary ligands. Only various types of co-ligands which are different dioxolene ligands, have been used.
Spin-Transition Polymers: From Molecular Materials Toward... - Science.
The Physics of Spin Crossover Fe(II), d Two contributions to the total 6 e g t 2g t 2g Two contributions to the total electron energy are important:-d-orbital splitting, 10Dq d electron pairing energy LS, S = 2 HS, S = 0 - - , Π≈15,000 cm–1 for Fe2+ SCO is possible when 10Dq HS < Π< 10Dq LS SCO is not possible when 10Dq HS <10,000 cm–1 or 10Dq.
Spin-Crossover Complexes - Chemistry Europe.
The alkyl chain carrying ligands N,N-di(pyridin-2-yl)butanamide (LC4) and N,N-di(pyridin-2-yl)decanamide (LC10) were combined with NCS- co-ligands to form the neutral heteroleptic Fe(II) complexes trans-[FeII(LC4)2(NCS)2] (1C4) and trans [FeII(LC10)2(NCS)2] (1C10). Variable temperature crystallographic studies revealed that 1C4 is in the orthorhombic space group Pna21 between 85-200 K whereas. This tutorial review aims at highlighting some of the developments of such structurally diverse and functionally intriguing 1D polymeric chains, 2D and 3D networks built from triazole or tetrazole ligands exhibiting fascinating spin crossover phenomena.
Spin-Crossover Materials - Wiley Online Library.
Spin-crossover (SCO) is a reversible transition between low and high spin states by external stimuli such as heat. The SCO behavior and transition temperature (T 1/2) of a series of [Fe II (X-pybox) 2](ClO 4) 2 were studied to establish a methodology for ligand-field engineering, where X-pybox stands for 2,6-bis(oxazolin-2-yl)pyridine substituted with X at the 4-position of the pyridine ring.
Spin states (d electrons) - Wikipedia.
. Spin crossover in a family of iron(II) complexes with hexadentate ligands: ligand strain as a factor determining the transition temperature.... The systematic change of the length of amino-aliphatic chains in these ligands results in chelate rings of different size: two six-membered rings for Hpy-DAPP, one five- and one six-membered rings for.
Amphiphilic Spin Crossover Complexes - EPub Bayreuth.
The switching of this material arises from the presence of iron(II) spin crossover centers within the framework lattice, the sorbed phases undergoing "half-spin" crossovers, and the desorbed phase showing no switching property.... The compressed octahedral coordination around the iron centers is completed by two axial thiocyanate ligands. Ligand eld in spin-crossover complexes can be chemically modulated to precisely tune the crossover temperature (T 1/2), de ned as the temperature at which the low-spin and high-spin states are equally populated,13 to near 37 C. Indeed, the utility of spin-crossover in MR thermometry has been demonstrated through T* 2 modulation in Fe. The crystal structures of five new iron(II) complexes were determined by X-ray diffraction: those of 1, 3, and 4 and two modifications of 3 (3B) and 4 (4B). Complexes 1 and 3B display incomplete spin crossover (SCO) behavior because of a freezing-in effect, whereas 3 and 4B undergo gradual and incomplete SCO behaviors.
Iron(III) spin crossover compounds — Aston Research Explorer.
The relationship between chemical structure and spin state in a transition metal complex has an important bearing on mechanistic bioinorganic chemistry, catalysis by base metals, and the design of spin crossover materials. The latter provide an ideal testbed for this question, since small changes in spin state energetics can be easily detected from shifts in the spin crossover equilibrium.
(PDF) Spin-Crossover Complexes.
Jan 19, 2009 · The X-ray analysis of three low-spin complexes [Fe(L)](BF(4))(2) revealed similarities in their molecular and crystal structures and magnetic measurements have shown that all synthesized complexes display spin-crossover behavior. This paper reports the synthesis of a family of mononuclear complexes [Fe(L)]X(2) (X=BF(4), PF(6), ClO(4)) with hexadentate ligands L=Hpy-DAPP ({bis[N-(2.
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