The spin-crossover (SCO) phenomenon between a high-spin and low-spin state has attracted much attention in the field of materials science. Among various kinds SCO complexes, triazole-bridged iron(II) polymeric chain system, [Fe(II)(R-trz)3]X2·xH2O (where trz is triazole X anion), exhibiting with thermal hysteresis around room temperature, been extensively studied from viewpoint molecular memory devices. In connection this we have controlled according to characteristic properties counter...

A proton-coupled electron transfer (PCET) reaction was widely studied with isolated organic molecules and metal complexes in solution view of the biological catalytic reaction, while studying this crystalline or solid-state phase, which has a novel example, would give insight into rather internal environment proteins without solvation creation new molecular materials. We tried to crystallize hydrogen-bonded (H-bonded) coordination polymer one-dimensional nanoporous channels, formed from...

Abstract We newly synthesized transparent films composed of pH-sensitive spin-crossover complex [FeII(diAMsar)] (diAMsar: 1,8-diaminosarcophagine) and an ion-exchange polymer, Nafion, having different colors corresponding to proton concentration. The UV–vis spectroscopic measurements revealed that the films, which were provided under pH 4, 7, 10 conditions, showed spin state depending on pH.

Abstract One-dimensional spin-crossover (SCO) polymers of formula [FeII(NH2-trz)3](CnH2n+1SO3)2·xH2O (trz: 4-substituted-1,2,4-triazole; n = 1–9) have been synthesized. They displayed hysteretic SCO transition around 280–350 K. The spin temperatures (T1/2) in the heating and cooling processes increased, hysteresis width became narrower with increasing alkyl chain length (n). From analysis EXAFS, nearest-neighbor Fe–Fe distance decreased n, it had a close relationship T1/2. This is highly...

H-Bonded metal complex dimers with reversible redox behaviour, which are connected by a low-barrier hydrogen bond (LBHB) very low energy barrier for proton transfer, can provide unique mixed-valency state stabilized the proton-coupled electron transfer (PCET) phenomenon. Using cyclic voltammetry measurements, newly prepared [ReIIICl2(PnPr3)2(Hbim)]2 (2) and [OsIIICl2(PnPr3)2(Hbim)]2 (3) existing as H-bonded in CH2Cl2 solution showed four-step four-electron containing two states of ReIIReIII...

Very strong intra- and inter-molecular hydrogen-bonding interactions coexist with π–π overlaps in a pure organic superconductor (TEA)(HEDO-TTF-dc) 2 ·2(H C O 4 ).

The $S=\frac{1}{2}$ quasi-one-dimensional antiferromagnet ${\mathrm{K}}_{2}{\mathrm{CuSO}}_{4}{X}_{2}\phantom{\rule{4pt}{0ex}}(X=\mathrm{Cl}$, Br) exhibits peculiar Dzyaloshinskii-Moriya (DM) interactions that are uniform along its spin chains and antiparallel with respect to neighboring chains. This feature has received much attention recently because it leads frustration, however, the dynamics around ${T}_{\mathrm{N}}$ magnetic structure have not been reported. Here we report behaviors of...

The first iron complexes of high-spin iron(II) species directly coordinated to verdazyl radicals, [FeII(vdCOO)2(H2O)2]·2H2O (1; vdCOO− = 1,5-dimethyl-6-oxo-verdazyl-3-carboxylate) and [FeII(vdCOO)2(D2O)2]·2D2O (2), were synthesized. crystal structure 1 was investigated by single-crystal X-ray diffraction at room temperature 90 K. compound crystallizes in the P space group with no phase transition between 300 crystals are composed discrete [FeII(vdCOO)2(H2O)2] crystallization water molecules....

This work demonstrated that the ligand symmetry of europium(iii) complexes controls ratiometric luminescence characteristics lanthanides. Nona-coordinated having unsymmetrical β-diketonate ligands (Cs) exhibit distinctive spectral variations in extremely narrow f-f transition bands over temperature range from 253 to 323 K. In contrast, no such change can be observed a series nona-coordinated containing symmetrical (C2v). The remarkable difference depending on (Csvs. C2v) suggests...

Abstract This study investigated the structure and phase transition behaviour of a dynamic water nanotube cluster (WNT) confined within hydrophilic 1D nanochannels. We demonstrated that WNT has three-layered hydrate stabilized by hydrogen bonds with carboxylate groups in outer channel walls. Moreover, it exhibits pre-melting state was attributed to presence metastable structures. Interestingly, maintained even melting because multi-layered nanoporous channel. To our knowledge, such is unique...

Double-bridged cofacial Ni porphyrin dimers 2 with 2,2'-bipyridyl pillars were effectively prepared by a one-step reductive homocoupling reaction of bis(chloropyridyl)-substituted derivatives followed specific separation cyanopropyl-modified silica gel column using pyridine eluent systems. The structural analyses and its Pd complex carried out in their solid solution states means X-ray single crystal analysis NMR, respectively. complexation η3-allylpalladium chloride (Pd) on the spatially...

The structural and electronic properties of interfaces composed donor acceptor molecules play important roles in the development organic opto-electronic devices. Epitaxial growth semiconductor offers a possibility to control interfacial structures explore precise at intermolecular contacts. 5,6,11,12-tetraazanaphthacene (TANC) is an molecule with molecular structure similar that pentacene, representative material, thus, good compatibility pentacene expected. In this study, physicochemical...

Functional metal–organic squares (MOSs) and cubes (MOCs) are important building units for zeolite-like frameworks (ZMOFs), which required to exhibit solid-state properties, such as dielectric magnetic properties.

Synthetic molecular crystals with one-dimensional nanoporous channels containing H2O molecules act as model systems for pores such aquaporin-1 in cell membranes. The structural characteristics o...

A new H-bonded crystal [Ru

The development of electron transport and n-type materials is still largely dominated by a limited number organic semiconductors, with fullerenes at the forefront. In contrast, substantial progress has been made in developing hole p-type materials. Therefore, expanding range acceptors, making them solution-processable, elucidating their structural arrangement X-ray crystallography essential. We synthesised 2,2'-bi-(5,6,11,12-tetraazanaphthacene) (bi-TANC) its triptycene end-capped...

Multicolour luminescence of a transparent emitter has been finely tuned through pH adjustment and external-voltage induced proton conduction in Nafion membrane.

[{Re^I(CO)₃(Hbim)}₃(tpta)]₂ (1, Hbim⁻ = 2,2′-biimidazolate monoanion, tpta 2,4,6-tripyridyl-1,3,5-triazine) was prepared as a nano-space supramolecule by using new group of H-bonded coordination capsules.

Although highly challenging, spontaneous crystallization without racemization can be an innovative strategy for the facile preparation of enantioselective conglomerate with planar chirality. Therefore, to explore feasibility this concept, we report a molecular design N-heteroacene focusing on inducing chirality using donor. We synthesized asymmetric donor–acceptor (D-A)-type derivative, FcTANC, composed ferrocene (Fc) and tetraazanaphthacene (TANC). Solution-state 1H NMR measurements...

A type of electron-accepting N-heteroacene which can be used as a bis-bidentate ligand, tetrapyrido[3,2-a:2′,3′-c:3′′,2′′-j:2′′′,3′′′-l][5,6,11,12]tetraazanaphthacene (TPy-TANC), was synthesized. T...

In order to develop new types of single-component molecular conductors with novel electronic structures and physical properties, the neutral gold dithiolate complex an etdt (= ethylenedithiotetrathiafulvalenedithiolate) ligand, [Au(etdt)2] was prepared. However, unlike reported metals, [Au(etdt)2]·THF (2) contains a solvent molecule tetrahydrofuran (THF). The crystals 2 form two-dimensional conducting layer structure, which are separated by terminal ethylene groups THF molecules. fairly high...

A novel square-planar cyclic tetranuclear nickel(II) complex coordinated by im-H2bizn− ligand (Him-H2bizn = 4,5-bis(4,5-dihydro-1H-imidazol-2-yl)imidazole), [NiII4(im-H2bizn)4(MeOH)4(py)4](ClO4)4·2ether (py pyridine), has been synthesized. The tetranickel(II) crystallized in C2/m space group and exhibited antiferromagnetic intramolecular coupling with J −24 K. arrests ClO4− ion moderate O–H⋯O weak multipoint C–H⋯O hydrogen bonds.