Regular BiBr5 chains of trans-connected octahedra are stabilized by methyviologen cations. The Bi3+ electron lone pair is sterochemically activated below −30 °C, leading to an acentric polar phase, and this correlated with increase the band gap, transfer from a para- ferroelectric phase.

The search for hybrid organic-inorganic materials, which have the great advantage that they can be synthesized at moderate temperature (T < 200 °C), remains a challenge in field of ferroelectrics. Here, room-temperature ferroelectric material with interesting characteristics, (MV)[BiI(3)Cl(2)] (MV(2+) = methylviologen), is reported. Its structure based on polar inorganic chains resulting from remarkable Cl/I segregation induced by methylviologen entities, coincide fourfold axis tetragonal...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectruophotometric Determination of Esters and Anhydrides by Hydroxamic Acid ReactionR. F. Goddu, N. LeBlanc, C. M. WrightCite this: Anal. Chem. 1955, 27, 8, 1251–1255Publication Date (Print):August 1, 1955Publication History Published online1 May 2002Published inissue 1 August 1955https://pubs.acs.org/doi/10.1021/ac60104a012https://doi.org/10.1021/ac60104a012research-articleACS PublicationsRequest reuse permissionsArticle...

A giant tetrahedral heterometallic polyoxometalate (POM) [Dy30 Co8 Ge12 W108 O408 (OH)42 (OH2 )30 ](56-) , which shows single-molecule magnet (SMM) behavior, is described. This hybrid contains the largest number of 4f ions any reported to date and first incorporate two different 3d-4f coordination cluster assemblies within same POM framework.

Syntheses, X-ray structural analyses, thermal behaviors, photochromism, and electrical properties of a series methylviologen (MV(2+)) halobismuthate hybrids, namely, (MV)(3)[Bi(4)Cl(18)](H(2)O)(y) (1a, y approximately = 1.7), (MV)(4)[Bi(6)Cl(26)](H(2)O)(y) (2a, (MV)(4)[Bi(6)Cl(25.6)I(0.4)](H(2)O)(y) (3a, 1.5), (MV)(4)[Bi(6)Cl(24.6)I(1.4)](H(2)O)(y) (4a, 1.3), are reported. Because the effect UV lamp or as result being heated up to 100 degrees C, all above compounds undergo complete 2a, 3a)...

With the aim to define key parameters causing photochromic properties of (MV)[Bi2Cl8] and (MV)4[Bi6Cl26] (MV2+, methylviologen; 1,1′-dimethyl-4,4′-bipyridinium), effects substituting Bi by Sb, Cl Br, or MV2+ MOV2+ (1,1′-dimethoxy-4,4′-bipyridinium) MeMOV2+ (1-methyl-1′-methoxy-4,4′-bipyridinium) on photoinduced charge transfer such viologen halometallates are explored. It appears that only salts containing chlorobismuthate anions undergo a color change upon UV irradiation nature entities has...

Using a slow liquid–gas diffusion method, the mixed-valence viologen salt (MV)2(BF4)3 (1) and radical cation (MV)(BF4) (2) are crystallized. Both structures contain regular stacks of MV˙+ cations or alternating MV2+ entities (1). A short intrastack intermolecular separation (3.23 Å) unprecedently reveals strong interactions between in 1.

Abstract Ein tetraedrisches heterometallisches Polyoxometallat (POM) [Dy 30 Co 8 Ge 12 W 108 O 408 (OH) 42 (OH 2 ) ] 56− , das Einzelmolekülmagnet(SMM)‐Verhalten zeigt, wird beschrieben. Das Riesenmolekül enthält die größte Zahl an 4f‐Ionen aller bisher beschriebenen POM und ist erste mit zwei verschiedenen 3d‐4f‐ 4f‐Koordinationsclustern im selben POM‐Netzwerk.

A slow liquid–gas diffusion method in strong acid conditions has allowed stabilizing for the first time solid state diprotonated form of 4,4′-bipyridine-N,N′-dioxide (bp4do), H2bp4do2+ as two polymophs chloride salt (H2bp4do)Cl2, while presence a metallic M(III)Br3 (M = Bi, Sb), monoprotonated Hbp4do+ is mainly stabilized (Hbp4do)2[Sb2Br8] and (H2bp4do)(Hbp4do)4[Bi4Br18]·2H2O. The dehydration this last phase leads to (H2bp4do)(Hbp4do)4[Bi4Br18]. In structures (H2bp4do)Cl2 salts, hydroxyl H...

To intimately combine a chelating ligand function with the numerous properties of viologen-like redox-active centre would offer rare possibility to design controllable multi-redox states, whose arise from strongly correlated phenomena between organic as well any metalloid coordinated centres. Such concept previously proved be feasible, however is not widely applicable owing challenges in terms synthesis, isolation, and aerial sensitivity both its metal complexes. Here we report first stable...

Abstract The {Fe 2 Dy } butterfly systems can show single molecule magnet (SMM) behaviour, the nature of which depends on details electronic structure, as previously demonstrated for [Fe (μ 3 ‐OH) (Me‐teaH) (O CPh) 6 ] compound, where [N,N‐bis‐(2‐hydroxyethyl)‐amino]‐2‐propanol (Me‐teaH ) ligand is usually used in its racemic form. Here, we describe consequences SMM properties by using enantiopure versions this and present first homochiral 3d/4 f SMM, could only be obtained S enantiomer...

We present a novel 1D hybrid salt (MQ)[CuBr₂]_∞ (MQ = <italic>N</italic>-methylquinoxalinium) containing less than 0.1% Cu^II and yet shows properties consistent with mixed valent structure.

The N,N'-dimethyl-3,3'-biquinoxalinium "methylbiquinoxen" dicationic platform is revealed to have even more fascinating possibilities than we originally thought in terms of its chemical versatility. In addition rich redox chemistry and coordination abilities, now unveiled an unexpected Lewis acid/base linked with a tuneable switching luminescence properties. This, amongst other things, allows for the facile fluorescent covalent labelling hydroxyl-terminated materials. This provides...

Ein riesiges 3d/4f/POM-Tetraeder …︁…︁ wurde durch einen Selbstorganisationsprozess hergestellt, der 4f- und 3d/4f-Koordinationscluster-Chemie mit Polyoxometallat(POM)-Chemie vereinigt. In ihrer Zuschrift auf S. 15795 ff. verwenden M. Ibrahim, A. K. Powell et al. trilakunare [GeW9O34]10−-POMs als Superliganden zum Aufbau des nanoskaligen Anions [{(GeW9O34)2DyIII3(µ-OH)3(H2O)}6{CoII2DyIII3(µ3-OH)6(OH2)6}4]56−, das 30 DyIII-, 8 CoII- 108 WVI-Metallzentren enthält ein Einzelmolekülmagnet ist. Es...

Biquinoxens synthesis <italic>via</italic> oxidative radical homocoupling of <italic>N</italic>-alkylquinoxalinium – an alternative method.