Two metal-free perovskite molecules with different 3D frameworks show reversible phase transition, dielectric anomaly and SHG effect.

Three-dimensional (3D) hybrid organic-inorganic perovskites (HOIPs) have attracted tremendous research interest due to their unique structure and promising applications. However, research on the design, synthesis and properties of this kind of metal-free crystalline material is still in the exploratory stage. Herein, two 3D perovskite molecules [1,4-3.

Three-Dimensional Perovskite Phase Transition Materials with Switchable Second Harmonic Generation Properties Introduced by Homochiral (1,4)-2,5-Diazabicyclo[2.2.1]-heptane.

Switchable second harmonic generation (SHG) materials have potential applications in information storage, signal processing, and so on because they can switch between SHG-on and SHG-off states. In this work, we designed and synthesized three organic-inorganic hybrid Rb halide three-dimensional (3D) perovskite materials [1,4 2,5-2.2.

Two 3D Rubidium Halide Organic-Inorganic Hybrid Perovskite Ferroelectrics Templated by Quasi-Spherical Organic Amine 1,4-Diazabicyclo[3.2.2]nonane.

The emergence of (CH NH )PbI has brought the development of three-dimensional (3D) organic-inorganic hybrid perovskite (OIHP) structures with ABX type to a higher level; however, most 3D frameworks are constructed by corner-sharing of BX octahedra. Herein, we substituted the spherical molecule 1,4-diazabicyclo[2.2.

Two host-guest grown ether supramolecules show switchable phase transition, dielectric and second-harmonic generation effect.

The excellent properties of host-guest crown ether inclusions in phase transition, dielectric and second-order nonlinear optical properties have attracted much attention. In this paper, we successfully designed and prepared two novel host-guest crown ether supramolecules [(DFBA)(15-crown-5)]X (X = ClO, 1; ReO, 2) by reactions of 2,6-difluorobenzylamine (DFBA) with 1,4,10,13-pentaoxacyclopentadecane (15-crown-5) in HClO, or HReO aqueous solution. By the introduction of difluoro-substituted benzylamine as a guest cation, the phase transition temperatures are greatly increased to 377 K for 1 and 391 K for 2.

The Role of Fluorine-Substituted Positions on the Phase Transition in Organic-Inorganic Hybrid Perovskite Compounds.

Although research on organic-inorganic hybrid perovskites (OIHPs) has grown exponentially in the past two decades, the high phase transition temperature of OIHP materials is still one of the insurmountable difficulties. Herein, a series of ABX type OIHP materials [(2,-DFBA)PbCl] ( = 3, for ; = 4, for ; = 5, for ; = 6, for ) have been prepared by reactions of double-substituted difluorobenzylamine (difluorobenzylamine = DFBA) with lead chloride in concentrated HCl aqueous solution. It was found the OIHP compounds - proceed a switchable phase transition with phase transition temperatures () at 449 K (), 462 K () and 500 K (), higher than that of the parent compound [(BA)PbCl] (BA = benzylammonium) at 438 K, but compound exhibits no phase transition.

Tin based organic-inorganic hybrid semiconductors with reversible phase transition and dielectric anomaly.

Organic-inorganic hybrid materials with perovskite structure have recently attracted tremendous interest due to their structural tunability and rich functional properties, such as phase transition and photoelectric properties. Within this context, two discrete tin-based organic-inorganic hybrid compounds [(FMBA)2SnCl6] (1) and [(FMBA)2SnBr6] (2) were prepared by the reaction of 3-fluoro-N-methylbenzylamine (FMBA) with SnX4 (X = Cl, Br) in the corresponding concentrated halogen acids HX. Differential scanning calorimetry (DSC) and dielectric measurements showed that both compounds underwent reversible phase transition and dielectric anomaly at a phase transition point above 400 K.

Fabrication of metal-organic single crystalline nanowires and reduced graphene oxide enhancement for an ultrasensitive electrochemical biosensor.

A novel strategy is first presented here to design and construct a good selective and highly sensitive dopamine (DA) biosensor based on single-crystalline CuPc nanowires with a reduced graphene oxide-Nafion film (rGON/CuPcNWs). Metal-organic semiconductor single-crystalline CuPc nanowires with excellent electronic properties and large surface-to-volume ratios were prepared using a physical vapor transport technique and modified onto a glassy carbon electrode (GCE), and exhibited high electrocatalytic activity for DA detection by immobilizing it onto a GCE with a film of the rGON composite. The introduction of a rGO-Nafion film can significantly improve the electrochemical signal of the CuPcNWs.

Designed self-assembled hybrid Au@CdS core-shell nanoparticles with negative charge and their application as highly selective biosensors.

A novel and general strategy for the synthesis of a monodispersed Au@CdS core-shell structure with uniform morphology and size through a self-assembly process is proposed here. The obtained negatively charged Au@CdS hybrid core-shell nanoparticles (NPs) are highly selective to dopamine (DA), in the presence of oxidation of ascorbic acid (AA) and uric acid (UA), based on electrostatic interaction. The fabricated biosensor shows a wide linear range from 0.

4,10-Bis(pyridin-2-ylmeth-yl)-1,7-dithia-4,10-diazo-niacyclo-dodecane bis(perchlorate).

The asymmetric unit of the title compound C(20)H(30)N(4)S(2) (+). 2ClO(4) (-) comprises one macrocyclic cation and two perchlorate anions. In the cation, one of the protonated H atoms bound to the amide N atom is involved in an intra-molecular N-H⋯N hydrogen bond.

Two W/Cu/S clusters: tetraethylammonium bromidodi-μ2-sulfido-sulfido[tris(3,5-dimethylpyrazol-1-yl)borato]copper(I)tungsten(VI) and tetraethylammonium dibromido-μ3-sulfido-di-μ2-sulfido-[tris(3,5-dimethylpyrazol-1-yl)borato]dicopper(I)tungsten(VI).

The reaction of (Et(4)N)[Tp*WS(3)] [Tp* = hydrogen tris(3,5-dimethylpyrazol-1-yl)borate] with one or two equivalents of CuBr afforded the [1 + 1] and [1 + 2] addition products (Et(4)N)[Tp*WS(μ-S)(2)(CuBr)] {or (C(8)H(20)N)[CuWBr(C(15)H(22)BN(6))S(3)], (I)} and (Et(4)N)[Tp*W(μ(3)-S)(μ-S)(2)(CuBr)(2)] {or (C(8)H(20)N)[Cu(2)WBr(2)(C(15)H(22)BN(6))S(3)], (II)}. The anion of (I) contains a [W(μ-S)(2)Cu] core formed by the addition of one CuBr unit to the [Tp*WS(3)] species. The anion of (II) has a butterfly-shaped [W(μ(3)-S)(μ-S)(2)Cu(2)] core formed by the addition of two CuBr units to the [Tp*WS(3)] species.

Bis[μ(2)-bis-(diphenyl-phosphino)methane]bis-(μ(2)-ethane-1,2-dithiol-ato)-μ(4)-sulfido-μ(2)-sulfido-disulfidodimolybdenum(V)disilver(I) dimethyl-formamide tris-olvate.

Treatment of [Et(4)N](2)[(edt)(2)Mo(2)S(2)(μ-S)(2)] (edt = ethane-dithio-l-ate) with two equivalents of Ag(CH(3)CN)(4)ClO(4) in the presence of bis-(diphenyl-phosphino)methane (dppm) ligand gives rise to the title tetra-nuclear cluster, [Ag(2)Mo(2)(C(2)H(4)S(2))(2)S(4)(C(25)H(22)P(2))(2)]·3C(3)H(7)NO. The complex mol-ecule and one of the dimethyl-formamide (DMF) solvent mol-ecules occupy special positions on a mirror plane. The mol-ecular structure of the complex may be visualized as being built of [Mo(2)S(2)(μ-S)(2)(edt)(2)](2-) dianions and [Ag(2)(dppm)(2)](2+) dications connected by two Ag-μ-S(edt) and two Ag-μ(4)-S bonds.

Tetra-ethyl-ammonium dicyanidobis(ethane-1,2-dithiol-ato)tetra-μ(3)-sulfido-dimolybdenum(V)dicopper(I).

The title compound, (C(8)H(20)N)(2)[Cu(2)Mo(2)(C(2)H(4)S(2))(2)(CN)(2)S(4)], is a sulfide-bridged tetranuclear complex in which the complex anion comprises one [(edt)(2)Mo(2)S(2)(μ-S)(2)](2-) unit (edt = ethanedithiol-ate) and two CuCN units joined through six Cu-μ(3)-S bonds, thus forming a cubane-like [Mo(2)S(4)Cu(2)] core. There are two independent cation-anion complex entities in the asymmetric unit. Bond distances are normal for this type of complex [ranges: Mo-S = 2.

catena-Poly[[(nitrato-κO,O')silver(I)]-μ-1,2-bis-(diphenyl-phosphino)ethane-κP:P'].

In the title chain compound, [Ag(NO(3))(C(26)H(24)P(2))](n), the bis-(diphenyl-phosphino)ethane (dppe) units link the Ag(+) ions into chains along [001]. A nitrate anion is coordinated to the Ag atom. There is a centre of symmetry at the mid-point of the ethane C-C bond and a twofold rotation axis passes through the Ag, N and terminal O atoms.

Di-μ-sulfato-bis-{[bis-(3,5-dimethyl-pyrazol-1-yl)methane]copper(II)}.

The mol-ecule of the title compound, [Cu(2)(SO(4))(2)(C(11)H(16)N(4))(2)], sits on a center of symmetry. The Cu(II) atom has a distorted trigonal-bipyramidal coordination geometry comprising three O atoms of the two symmetry-related SO(4) (2-) anions and two N atoms from one bis-(3,5-dimethyl-pyrazol-1-yl)methane ligand.

C-H...pi, pi-pi and C-H...Cl interactions in chloro-substituted Schiff bases and 4-chloro-N-[4-(dimethylamino)benzylidene]aniline.

Molecular packing analyses were carried out on 15 crystal data sets of chloro-substituted Schiff bases, including that of the title compound, C15H15ClN2. C-H..