NMR-Relaxometric Investigation of Mn(II)-Doped Polyoxometalates in Aqueous Solutions.

Solution behavior of K;[(Mn(HO))PWO]·7HO (), Na(NH)H[(Mn(HO))(WO(HO))(α-B-SbWO)]·27HO (), and NaH[(Mn(HO))(WO)(β-B-TeWO)]·19HO () was studied with NMR-relaxometry and HPLC-ICP-AES (High Performance Liquid Chromatography coupled with Inductively Coupled Plasma Atomic Emission Spectroscopy). According to the data, the [(Mn(HO))PWO] Keggin-type anion is the most stable in water among the tested complexes, even in the presence of ethylenediaminetetraacetic acid (EDTA) or diethylenetriaminepentaacetic acid (DTPA). Aqueous solutions of and anions are less stable and contain other species resulting from dissociation of Mn.

Proton Affinity in the Chemistry of Beta-Octamolybdate: HPLC-ICP-AES, NMR and Structural Studies.

The affinity of [β-MoO] toward different proton sources has been studied in various conditions. The proposed sites for proton coordination were highlighted with single crystal X-ray diffraction (SCXRD) analysis of (BuN)[β-{Ag(py-NH)MoO]}] () and from analysis of reported structures. Structural rearrangement of [β-MoO] as a direct response to protonation was studied in solution with Mo NMR and HPLC-ICP-AES techniques.

Coordination of Pt(IV) by {PW} Macrocyclic Inorganic Cavitand: Structural, Solution, and Electrochemical Studies.

Hydrothermal reaction of a macrocyclic inorganic POM cavitand Li(NH)H[PWO] with [Pt(HO)(OH)] results in coordination of up to six {Pt(HO)(OH)} fragments to the internal surface of the polyoxoanion. The product was isolated as K(NH)H[{Pt(OH)(HO)}PWO]·79HO () and characterized by multiple techniques in the solid state (SCXRD, XRPD, XPS, FTIR, and TGA) and in solution (NMR, ESI-MS, and HPLC-ICP-AES). Electrochemical properties were studied both in solution and as components of the paste electrode.

Heterostructures Based on Cobalt Phthalocyanine Films Decorated with Gold Nanoparticles for the Detection of Low Concentrations of Ammonia and Nitric Oxide.

This work is aimed at the development of new heterostructures based on cobalt phthalocyanines (CoPc) and gold nanoparticles (AuNPs), and the evaluation of the prospects of their use to determine low concentrations of ammonia and nitric oxide. For this purpose, CoPc films were decorated with AuNPs by gas-phase methods (MOCVD and PVD) and drop-casting (DC), and their chemiresistive sensor response to low concentrations of NO (10-50 ppb) and NH (1-10 ppm) was investigated. A comparative analysis of the characteristics of heterostructures depending on the preparation methods was carried out.

Rh(III) hydroxocomplexes speciation using HPLC-ESI-MS.

A mixture of rhodium(iii) hydroxocomplexes formed during the polycondensation process in alkaline media has been fully characterized by the hyphenated high performance liquid chromatography with electrospray ionization mass spectrometry (HPLC-ESI-MS). The baseline separation was achieved using reverse phase ion-pair chromatography (RP-IP-HPLC) in gradient elution mode. When using SDS as the ion pair, the formation of all types of its associates with the molecules of acetonitrile, as well as oligomers of rhodium aquahydroxocomplexes, etc.

Is It Possible To Prepare a Heterometal Anderson-Evans Type Anion?

Reaction of [SbWO] with [Pt(HO)(OH)] results in the first example of the mixed addenda Anderson-Evans type Pt{Sb(OH)}WO] anion, isolated and characterized as KNa[Pt{Sb(OH)}WO](NO)(OH)11HO ().

[{AgL}MoO] complexes: a combined experimental and theoretical study.

Self-assembly reactions between AgNO, L (PPh, PPhPy, AsPh, SbPh) and [β-MoO] in DMF led to the formation of [β-{AgL}MoO] anions, which were isolated as BuN salts (1-4) and characterized by XRD, IR and elemental analysis. In the crystal structures Ag can switch the coordination number from 5 (P, As) to 6 (Sb) by uptake of a DMF molecule. High-level QAIM analysis of the coordination sphere around Ag shows critical points even in the case of longer Ag-O distances.

Reactions of [Ru(NO)Cl] with pseudotrilacunary {XWO} (X = As, Sb) anions.

Reactions of [Ru(NO)Cl] with pseudotrivacant B-α-[XWO] (X = As, Sb) at 160 °C result in the rearrangement of polyoxometalate backbones into {XM} structures. In the case of arsenic, oxidation of As to As takes place with the formation of a mixture of plenary and monosubstituted Dawson [AsWO] and [AsWRu(NO)O] anions, of which the latter was isolated as MeNH (DMA-1a and DMA-1b) and BuN (BuN-1) salts and fully characterized. Both α and α isomers of [AsWRu(NO)O] were present in the reaction mixture; pure [α-AsWRu(NO)O] was isolated as the BuN salt.

The study of Rh(iii) hydroxocomplexes using capillary zone electrophoresis with a UV-Vis detector: the development of the method.

The expediency of capillary zone electrophoresis application in the study of a mixture of rhodium(iii) hydroxocomplexes is shown for the species formed during the thermal treatment of [Rh(OH)] at 60 °C in alkaline media. As these compounds are unstable in solution because of polycondensation at pH > 10 and the formation of insoluble rhodium(iii) hydroxides at pH 5-10, their acidic derivatives with terminal aqua ligands acted as the objects of the study. Optimal separation conditions were achieved using sodium perchlorate as a background electrolyte, a voltage of +20 kV and pH 2.