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The interaction of Cu(NO3)2 with pentyl {[benzyl(dibutyl)ammonio]methyl}phosphonate (L) was studied by Fourier Transform Infrared (FTIR) spectroscopy with the use of isomolar series solution. The changes in the nitro group stretching bands and phosphoryl P O stretching bands of L were monitored. The copper(II) complex of pentyl {[benzyl(dibutyl)ammonio]methyl}phosphonate, has been synthesized and characterized by routine X-ray, IR and NMR 1H, 31P and 13C spectroscopy. Single crystal X-ray diffraction analysis showed that crystal is formed by the dinuclear centrosymmetric metal complex, which is formed by copper, pentyl {[benzyl(dibutyl)ammonio]methyl}phosphonate and NO3− groups in a 2:2:4 ratio.

The new redox active coordination polymer [Cd(H2O)2(fc(PHOO)2)·2H2O]n (fc = 1,1′-ferrocenediyl) was synthesized and structurally characterized by single-crystal X-ray diffraction. In this compound cadmium atoms are bound by phosphinate fragments to give infinite chains, the latter are interconnected by ferrocene groups to form 2D coordination polymer. Electrochemical properties of CP were investigated. It’s found that Cd-polymer is harder to oxidize than its isostructural cobalt analogue. This means that increase in the length of the M − O bond in coordination polymer, oxidation becomes harder.

The reactivity of unsymmetrical pyrazole-based PCN pincer Ni(II) halides has been tested in the presence of copper(II) halides as an oxidizing agent as well as with NaBH4 and LiAlH4 as a hydride source. While the reaction with CuX2 resulted into the generation of metastable PCN pincer Ni(III) species, the treatment of (tBuPCN)NiCl with NaBH4 led to the preparation and isolation of the borohydride complex (tBuPCN)Ni(BH4). Attempts to isolate nickel-hydride species upon treatment of (tBuPCN)NiCl with either NaBH4 or LiAlH4 invariably led to the formation of free PCN(H) ligand and metallic Ni(0) nanoparticles after an in situ reductive elimination from the (metastable) hydride derivative (tBuPCN)NiH. Finally, the halide complexes (pre-activated by MMAO) have been tested as homogeneous catalysts in ethylene oligomerization showing moderate activity (∼ 14 × 103 molC2H4⋅molNi−1⋅h−1) with the formation of even-numbered olefins (mainly C4–C10 fractions) as products.

The two new nickel complexes [Ni(P R 2 N Ph(CH)Ph 2 ) 2 ] 2+ (where R = Ph or o -Py) with cyclic 1,5-diaza-3,7-diphosphacyclooctane ligands have been synthesized. All complexes are effective electrocatalysts for hydrogen production using [(DMF)H] + as proton source in acetonitrile. The bulky benzhydryl substituent at nitrogen atom leads to higher catalytic activity comparison to benzyl. The introduction o -Py substituents at phosphorus as additional basic center is caused by the changing of voltage–current picture and significantly catalytic current enhancement. TOFs being 100 and 15200 s −1 for R = Ph and o-Py, respectively.

A new electrocatalytic method for the phosphonation of 2-phenylpyridine was developed. The joint electrochemical oxidation of a mixture of palladium acetate, 2-phenylpyridine, and H-diethylphosphonate affords the ortho C–H phosphonation product. The electrocatalytic synthesis proceeds under mild conditions (room temperature) at potentials that clearly generate high oxidation state of palladium complexes without any specially added oxidizing agents. An intermediate dipalladium [(PhPy)Pd(EtO)2P(O)]2 complex was isolated, the structure was confirmed by X-ray analysis. Cyclic voltammetry studies reveal the [(PhPy)Pd(EtO)2P(O)]2 complex to be oxidized at more positive potentials compared with the acetate palladacycle [(PhPy)Pd(OAc)]2. Preparative oxidation of the diethylphosphonate palladium complex affords 2-phenylpyridine C–H bond phosphonation product.

The series of ferrocenylphosphinic acids Fc(P(R)(O)(OH)) (1a–d) and ferrocene-1,1′-diyl-phosphinic acids Fc(P(R)(O)(OH))2 (2a–d) (R = H (a), Me (b), Et (c), Ph (d)) have been obtained and studied using X-ray single crystal diffraction, IR-spectroscopy and quantum chemistry. The intermolecular hydrogen bonding in 1a–d proceeds highly stereoselectively and results in formation of racemic conglomerate of 1d. The formation of inter- and intra-molecular hydrogen bonds for disubstituted acids 2c–d depends on substituent at phosphorus atoms.