Three K[M(salen)(CN)2]-based trinuclear sandwich-like heterobimetallic M(III)–Cu(II) (M = Fe,Cr, Co) complexes: synthesis,crystal structures,and magnetic properties

Transition Metal Chemistry - Three trans-dicyanoiron(III) precursors K[M(salen)(CN)2] (M = Fe, Cr or Co; H2salen = N,N′-bis(salicyl)ethylenediamine) and...     

Insights into the mechanism of binding of the gold(III) dithiocarbamate derivatives to cysteine or DNA purine bases

Structural Chemistry - Complexes Au(DMDT)Br2 (DMDT = N,N-dimethyldithiocarbamate), Au(ESDT)Br2 (ESDT = ethylsarcosinedithiocarbamate) and Au(ESDT)Cl2 are likely...     

Syntheses,interconversions and reactivity of heteropalladacycles made from aryl isocyanates and various phenanthroline Pd(II) precursors with small molecules

The synthesis and full characterisation of new families of palladacycles such as (o-phen)PdN(Ar)C(O)N(Ar)C(O) (2/2a–g), (o-phen)PdN(Ar)C(O)N(Ar)C(O)N(Ar) (3/3a–c) and (o-phen)PdN(Ar)C(O)N(Ar) (4/4a–b) is reported (o-phen = 2,2’-phenanthroline), as well as the X-ray structure of the six-member palladacycle (o-phen)PdN(Tol)C(O)N(Tol)C(O)N(Tol) (3c·Et₂O). The reactivity of these palladacycles with small molecules like CO, PhNCO and H⁺ is also investigated. This contribution reveals a rich chemistry and provides a complete picture of the possible interconversions existing between members of different families. Analysed in the context of the catalytic carbonylation of nitroaromatics, this study also gives some clues to understanding the disappointing results reported for (Pd/o-phen/H⁺) catalytic systems when the transformation is attempted in the absence of alcoholic solvent. Notably, the formation of five-member palladacycles like 2 under these conditions could be at the origin of the catalyst deactivation.     

PROPIOLATE CLUSTER COMPLEXES (Bu4N)2[Mo6X8(OOC–C≡CH)6] (X = Br,I)

Journal of Structural Chemistry - Two new cluster complexes (Bu4N)2[Mo6X8(OOC–C≡CH)6] (1) (X = Br) and (2) (X = I) are synthesized by the reaction of...     

SYNTHESIS,CRYSTAL STRUCTURE AND ELECTROCHEMISTRY PROPERTIES OF Cu-COMPOUND BY RIGID LIGAND

Journal of Structural Chemistry - A new novel Cu(II) compound formulated as Cu(C4N6H4)2Cl2 (1) (C4N6H4 = 1H-3,4′-bi-1,2,4-triazole) is successfully synthesized by a...     

Simultaneous determination of Hg(II) and Cu(II) in water samples using fluorescence quenching sensor of N-doped and N,K co-doped graphene quantum dots

The present study was aimed to use of N doped graphene quantum dots (N-GQDs) and N,K co-doped graphene quantum dots (N,K-GQDs) as a fluorescence quenching sensor to determine both mercury and copper in water sample, simultaneously using simple fluorescence protocol. Each of N-GQDs or N,K-GQDs was optimized separately with 1–5% (w/v) HNO₃ or KNO₃, respectively, and their quantum yields were determined and compared. It was found that N-GQDs, obtained from 3% (w/v) HNO₃ doped resulted higher fluorescence intensity at the maximum excitation and emission wavelengths of 370 and 460 nm, respectively, with higher quantum yield (QY = 83.42%) compared with that of undoped GQDs (QY = 16.35%). While N,K-GQDs obtained from 5%(w/v) KNO₃ gave somewhat different fluorescence spectrum, but still had the same maximum excitation and emission wavelengths with rather highest QY (94.07%). However, it is interesting that detection sensitivity expressed as slope of their calibration curve (y = 5.43x − 19.48; r² = 0.9971) of the N-GQDs is rather higher than that (y = 1.29x + 17.66; r² = 0.9977) of the N,K-GQDs for Hg²⁺ fluorescence quenching sensor, and the fluorescence intensity of N-GQDs had better selectively quenching effect only by both Hg²⁺ and Cu²⁺. Thus, their quenching effects were selected to develop the fluorescence turn-off sensor for trace level of both metal ions in real water samples. For method validation, the N-GQDs exhibited high sensitivity to detect both Hg²⁺ and Cu²⁺ with wide linear ranges of 20–100 μM and 100–500 μM, respectively. Limit of detection (LOD) and limit of quantitation (LOQ) were 0.42 μM & 1.41 μM for Hg²⁺ and 13.19 μM & 43.97 μM for Cu²⁺, respectively, with their precision expressed as an intra-day and an inter-day analysis of 6.98% & 11.35% for Hg²⁺ and 11.78% & 9.43% for Cu²⁺, respectively. Also the study of matrix analysis of the water samples (drinking water and tap water), was carried out using N-GQDs and N,K-GQDs resulted good percentage recoveries in comparison with those using undoped GQDs under the same optimum conditions.     

CRYSTAL STRUCTURE OF La(III), Pr(III), AND Eu(III) COMPLEXES WITH A MACROCYCLIC CAVITAND CUCURBIT[6]URIL

Journal of Structural Chemistry - Complexes [La(H2O)3(DMF@C36H36N24O12)(NO3)](NO3)2·6H2O (1) and [M(H2O)3(DMF@C36H36N24O12) (HCOO)](NO3)2·6H2O (where M = Pr (2) and Eu...     

STRUCTURE AND COMPOSITION OF [(nacnac)MnCl]2 (nacnac = HC(C(Me)N(2.6-i-Pr2C6H3))2) PRODUCTS REDUCED BY POTASSIUM-INTERCALATED GRAPHITE IN TOLUENE AND BENZENE

Journal of Structural Chemistry - The reduction of [(nacnac)MnCl]2 (1) (nacnac = HC(C(Me)N(2.6-i-Pr2C6H3))2) by potassium intercalated graphite KC8 in toluene and benzene is...     

New carbacylamidophosphates (CAPh) and CAPh-containing coordination compounds: structural peculiarities

Structural Chemistry - The new carbacylamidophosphate derivative HL1 (1) with general formula Cl3CC(O)N(H)P(O)(CH2C5H4N)2 named...     

BAND STRUCTURE OF BePb–V2 PNICTIDES: AB INITIO CALCULATIONS

Journal of Structural Chemistry - The electronic structure of BePb–V2 crystals (V = N, P, As, Sb) with chalcopyrite structure is studied. The energy band structure and...     

N-donor stabilized complexes of nickel(II) diphenyldithiophosphates: single-crystal X-ray,HSA and computational analysis

Transition Metal Chemistry - Nickel(II) complexes with octahedral coordination stabilized by N-donor ligands corresponds to [{(ArO)2PS2}2Ni·L2] [Ar = 4-(C2H5)C6H4 (3), and...     

Effect of 165-keV Ar-ion irradiation on microstructural and mechanical properties of zircaloy-4

Journal of Radioanalytical and Nuclear Chemistry - Cold-worked zircaloy-4 was irradiated by 165 keV Ar ion at room temperature. The aim of the study is to understand the correlation...     

Synthesis and characterization of Cu(I) and Cu(II) complexes containing ketiminate ligands

A series of Cu(I) and Cu(II) complexes containing substituted ketiminate ligands was synthesized. Reaction of CuCl₂ with 2 equiv. of Li[OC(Me)CHC(Me)N(Ar)] in toluene generated dark green solid of Cu[OC(Me)CHC(Me)N(Ar)]₂ (1). Similarly, Cu(I) complex, {Cu[OC(Me)CHC(Me)N(Ar)]Li[OC(Me)CHC(Me)N(Ar)]}₂ (2) was synthesized by reacting 2 equiv. of Li[OC(Me)CHC(Me)N(Ar)] with CuCl in toluene at room temperature for 12 h. While the reaction of CuCl with Li[OC(Me)CHC(Me)N(Ar)] in the presence of triphenylphosphine in THF solution at room temperature, a three-coordinated Cu[OC(Me)CHC(Me)N(Ar)](PPh₃) (3) can be isolated in high yield. Replacing the PPh₃ of 3 with N-heterocarbene (NHC) generates Cu[OC(Me)CHC(Me)N(Ar)](NHC) (4) in low yield. Complexes 2, 3, and 4 were characterized by ¹H and ¹³C NMR spectroscopies and all molecules were structurally characterized by X-ray diffractometry. Two coordination modes of ketiminate ligands were found in the molecular structure of 2, one of which is copper-coordinated terminal ketiminates and the other is lithium-copper-coordinated bridging ketiminates.     

Construction of poly-iodine aromatic carboxylate Mn/Co frameworks and iodine adsorption behavior

Transition Metal Chemistry - Two poly-iodine aromatic tricarboxylate complexes: {(Me2NH2)[Mn(TIBTC)(2, 2'-bipy)(H2O)]}n (1) and {(Me2NH2)[Co(TIBTC)(DMA)]}n (2) (DMA?=?N,...     

Synthesis and Molecular Structure of Binuclear ansa-Bis(amidinate) Ytterbium Complex [1,3-C6H4{NC(Ph)N(SiMe3)}2]3Yb2

Russian Journal of Coordination Chemistry - The exchange reaction of anhydrous YbCl3 with [1,3-C6H4{NC(Ph)N(SiMe3)}2Li2(THF)2]2 (I) (4 : 3 molar ratio, THF) gave ansa-bis(amidinate)...     

Coordination of niobium and tantalum oxides by Ar, Xe and O2: Matrix isolation infrared spectroscopic and theoretical study of NbO2(Ng)2 (Ng = Ar, Xe) and MO4(X) (M = Nb, Ta; X = Ar, Xe, O2) in solid argon

The combination of matrix isolation infrared spectroscopic and quantum chemical calculation results indicate that the NbO₂ molecule is coordinated by two noble gas atoms in forming the NbO₂(Ng)₂ (Ng = Ar, Xe) complexes in solid noble gas matrixes. In contrast, the TaO₂ molecule is not able to form similar noble gas complex. The niobium and tantalum dioxides further react with dioxygen to form the side-on bonded superoxo-dioxide complexes MO₄ (M = Nb, Ta), which are coordinated by one argon atom in solid argon matrix. The coordinated Ar atom in MO₄(Ar) can be replaced by O₂ or Xe in forming the MO₆ and MO₄(Xe) complexes. The results indicate that the NbO₂, NbO₄ and TaO₄ molecules trapped in solid noble gas matrixes should be regarded as the NbO₂(Ng)₂ and MO₄(Ng) (Ng = Ar, Xe; M = Nb, Ta) complexes instead of “isolated” metal oxide species.     

Easy preparation of recyclable thermally stable visible-light-active graphitic-C3N4/TiO2 nanocomposite photocatalyst for efficient decomposition of hazardous organic industrial pollutants in aqueous medium

Research on Chemical Intermediates - Graphitic-C3N4/TiO2 nanocomposite was prepared as a photocatalyst (PC) active under visible light (λ?≥?420 nm) by preparation of...     

Effects of La-doping on structural,electrical and multiferroic properties of Bi6Fe2Ti3O18 thin films

Journal of Sol-Gel Science and Technology - Bi6Fe2Ti3O18 (BFTO) and La-doped Bi6?xLaxFe2Ti3O18 (BLFT) (x = 0.03; BLFT3, x = 0.06; BLFT6 and 0.09; BLFT9)...     

Gas-tight proton-conducting Nd2 − xCaxZr2O7 − δ (x = 0, 0.05) ceramics

Journal of Solid State Electrochemistry - Gas-tight Nd2 − xCaxZr2O7 − δ (x = 0, 0.05) pyrochlore materials have been prepared via...