Mihaela Cibian

University of Quebec at Trois-Rivieres · Département de Chimie Biochimie et Physique

Bright-yellow single crystals of the title compound were synthesized as part of a project that explores the formation of earth-abundant transition-metal complexes of amidine oxides (AMOXs), to study their photophysical and redox properties. The HNCNO moiety of the compound shows double-bond delocalization over the N—C—N part, evident from the simil...

Herein we report a water-soluble cobalt porphyrin that efficiently catalyzes the photoreduction of CO 2 in fully aqueous media with a good selectivity over H 2 production.

The title compound, C30H39N3·0.5C7H8, is a symmetrically N,N′-disubstituted aryl­amidine containing a 4-pyridyl substituent on the carbon atom of the N–C–N linkage and bulky 2,6-diiso­propyl­phenyl groups on the nitro­gen atoms. It crystallizes in the Z-anti configuration and its amidine C—N bonds present amine [1.368 (1) Å] and imine [1.286 (1) Å]...

Without using precious elements, a highly efficient and selective molecular-based photocatalytic system for CO2-to-CO conversion in fully aqueous media has been developed. Our copper(I)-based water-soluble photosensitizer (CuPS) preserves its highly luminescent and long-lived excited state even in aqueous media. The CuPS-driven CO2 reduction cataly...

Herein we report an earth-abundant photocatalytic system for CO 2 reduction to CO based on an iron catalyst combined with a Cu I photosensitizer. Under visible light irradiation CO is produced as...

The performance of a water-soluble cobalt porphyrin (CoTPPS) as a catalyst for the photoreduction of CO2 in fully aqueous media has been investigated under visible light irradiation using [Ru(bpy)3]²⁺ as a photosensitizer and ascorbate as a sacrificial electron donor. CO is selectively produced (> 82%) with high efficiency (926 TONCO). Upon optimiz...

The synthesis, characterization, photophysical and redox properties of a dinuclear complex Zn2(AMOX)4 (AMOX = 4‐bromo‐N,N′‐diphenylbenzamidinate N‐oxide) are highlighted. This compound is a first example of a novel class of aggregation‐induced emission (AIE) materials. Noticeably, solution‐processed white‐green organic light‐emitting diodes were fa...

Controlled double-deck packing is an appealing means to expand upon conventional 2D self-assembly which is critical in crystal engineering, yet it is rare and poorly understood. Herein, we report the first systematic study of double-deck assembly in a series of alkylated aminoquinone derivatives at the liquid-solid interface. The competition betwee...

Herein, we describe the preparation, characterization and photophysical properties of neutral lanthanide complexes containing a redox-active ligand 1-(2-pyridylazo)-2-phenanthrol (papl). The complexes likely share similar structural features and bear the formulation Ln(papl)3 (Ln(III) = Gd, Dy, Tb), which is supported by electrospray ionization mas...

Two bis-terdentate cyclometalated Ir(III) complexes with polypyridyl (N^N^N) and cyclometalated (C^N^C) ligands [Ir-Py]⁺ and [Ir-Py-Me]²⁺ have been synthesized and characterized. Their absorption and emission properties have been examined, more particularly in MeCN as a function of the addition of different acids. Depending on the acid strength and...

In the on-going quest to harvest near-infrared (NIR) photons for energy conversion applications, a novel family of neutral ruthenium(ii) sensitizers has been developed by cyclometalation of an azadipyrromethene chromophore. These rare examples of neutral ruthenium complexes based on polypyridine ligands exhibit an impressive panchromaticity achieve...

Homoleptic zinc(II) complexes (3a-3d) of the bulky N,N′-diarylformamidinate N-oxide ligands N-hydroxy-N,N′-bis(2,6-diisopropylphenyl)formamidine (2a), N-hydroxy-N,N′-bis(2,6-dimethylphenyl)formamidine (2b), N-hydroxy-N,N′-bis(2-isopropylphenyl)formamidine (2c) and N-hydroxy-N,N′-bis(2-biphenyl)formamidine (2d) were synthesized and characterized. Th...

Structural analysis and spectroscopic methods revealed a special case of solvatomorphism: hydrogen-bonding-induced geometry and spin change within a same N,O-(bis)chelate of cobalt(II). Solid-state structures are presented for both the tetrahedral and the solvated square-planar forms of the complex. Magnetic-moment measurements and ESR spectroscopy...

We present a general method for the preparation of bis(pyridyl-1,3,5-triazine) (dpt) ligands via Stille coupling chemistry. The synthetic procedure surpasses known trimerisation procedures in terms of yield, flexibility, and diversity, as ditopic ligands with different spacers are now available. Polythiophene spacers give rise to different colours...

The crystal structures of fac-(aceto­nitrile-κN)(2-{[3,5-bis­(4-meth­oxy­phen­yl)-2H-pyrrol-2-yl­idene-κN¹]amino}-3,5-bis­(4- meth­oxy­phen­yl)-1H-pyrrol-1-ido-κN¹)tricarbon­ylrhenium(I)–hexa­ne–aceto­nitrile (2/1/2), [Re(C36H30N3O4)(CH3CN)(CO)3]·0.5C6H14·CH3CN, (2), and fac-(2-{[3,5-bis­(4-meth­oxy­phen­yl)-2H-pyrrol-2-yl­idene-κN¹]amino}-3,5-bis­...

Cobalt(II) complexes of bulky N,N′-diarylformamidinate N-oxide ligands were synthesized and structurally characterized. The cobalt(II) bis(chelates) are square-planar (low spin) in the solid state, according to XRD and magnetic measurements (μeff = 1.8 to 2.1 μB), but show square-planar (low spin) to tetrahedral (high spin: μeff = 3.5 to 4.7 μB) is...

As analogues of the porphyrinoid and dipyrromethene families of dye, azadipyrromethene (ADPM) derivatives exhibit exciting photophysical properties. Their high absorbance (ε up to 100 000 M-1cm-1) in the yellow-to-red region and the strong NIR luminescence encountered in boron-chelated Aza-BODIPY analogues are especially interesting in the context...

N,N'-Disubstituted hydroxyamidines/ α-aminonitrones (AMOXs) present high steric and electronic modularity (substituents can be varied on the central C atom and/or on the N atoms) resulting in precise electronic tunability, enhanced by the delocalization on the amidine backbone. They are good chelating ligands, forming stable 5-membered chelate ring...

In the title compound, C18H22N2O, the dihedral angle between the benzene ring and the pyridine ring is 80.0 (1)°. In the crystal, N—H⋯O hydrogen bonds connect the mol­ecules into chains along the b axis. The packing also features C—H⋯O and C—H⋯N hydrogen bonds and C—H⋯π interactions, one directed to the benzene ring and the other to the center of t...

The N-oxidation of N, N'-disubstituted amidines with MCPBA (m-chloroperoxibenzoic acid) affords a mild, rapid, and efficient route to the corresponding hydroxyamidines This novel synthetic route for the preparation of N, N'-disubstituted hydroxyamidines provides an attractive alternative to the classical one. It was found that the efficiency of the...

Novel hydroxyamidinate complexes of cobalt(II) are presented, together with their electrochemical and spectroscopic properties. An unusual d(7) square-planar coordination around the cobalt(II) center exists and was confirmed by chemical oxidation to its Co(III) species. The Co(II) complex is difficult to reduce, but its facile oxidation suggests th...

The title compound, C21H16NP, is a known P—N chelator and various crystal structures of its metal complexes have been reported. However, no crystallographic evidence of the free ligand has been given to date. The phenyl rings are almost orthogonal to one another [dihedral angle = 88.9 (1)°], and they are twisted from the mean plane of the quinoline...

The title compound, C13H11BrN2O, a hydroxy­amidine derivative (an amidoxime), was obtained by addition of the corresponding imidoyl chloride to hydroxy­lamine. The benzene and phenyl rings are twisted from the mean plane of the hydroxy­amidine group by 34.4 (1) and 59.2 (1)°, respectively. In the crystal structure, inter­molecular O—H⋯N hydrogen bo...

The title compound, 2C17H20N2O·CH2Cl2, was obtained by N-oxidation of the parent formamidine with m-chloro-peroxy­benzoic acid (m-CPBA). This is the first use of the above-mentioned synthetic route for the preparation of hydroxy­amidines. The title compound crystallizes as a cyclic dimer resulting from the presence of O—H⋯O and N—H⋯N hydrogen bonds...

The title compound, C13H11BrN2O, a hydroxyamidine derivative (an amidoxime), was obtained by addition of the corresponding imidoyl chloride to hydroxylamine. The benzene and phenyl rings are twisted from the mean plane of the hydroxyamidine group by 34.4 (1) and 59.2 (1)°, respectively. In the crystal structure, intermolecular O—H...N hydrogen bond...