Reaction of PtCl4 with 18-crown-6 in aprotic solvents (Nitromethane, acetonitrile, and 1,2-dichloroethane)

Reaction of rhodium trichloride and dirhodium(II) acetate with trans-4,4′-bis(diethoxyphosphoryl)biphenyl-18-crown-6

“…In the region of 10.36-11.0 ppm in the 1 H NMR spectrum of compound III in CD 3 COCD 3 there is a broad singlet [δ 10.87 ppm (6H, H 3 O + )], which is characteristic of the complexes of hydronium ion with crown ethers [3,21] .…”

“…The crown ether complexes may have a structure in which the hydronium ion is directly bound to the crown ring and is stabilized by three hydrogen bonds between H 3 O + and every second oxygen atom [3,7,18,19]. The nature of the specific interaction of crown ether with the molecules containing O-H bonds is explainable by the formation of either a complex system of hydrogen bonds or electrostatic interaction, as well as by combined interactions of these two types, as seen from the characteristic changes in the 1 H NMR and IR spectra.…”

“…The compounds were characterized by NMR, IR, Raman, ESR, X-ray electron spectroscopy, conductivity, and the data of elemental and X-ray fluorescence analyses. The predominant role of diethoxyphosphoryl groups at the macrocycle in binding rhodium(III) and dirhodium(II) ions was demonstrated.There is a great interest nowadays in a modified type of macrocyclic polyethers containing a variety of additional groups that supply the polyester cycle with a number of useful properties, such as changing the hydrophilic and surfactant properties of polyesters [1], improve the complexing properties towards transition metal cations [2].In this work, continuing a series of research on the interaction of transition elements with macrocyclic compounds, we studied the complexing ability of RhCl 3 ·3H 2 O (I) and [RH 2 (CH 3 COO) 4 ·2H 2 O] (II) with a derivative of dibenzo-18-crown-6 (DB-18-CR-6) containing two diethoxyphosphoryl groups as substituents in the benzene rings in the trans position, the trans-4,4'-bis(diethoxyphosphoryl)biphenyl-18-crown-6 (L) [3][4][5].The main characteristics of the non-coordinated ligand have been described in [5]. In a number of works [6, 7] the reactivity has been studied of certain types of crown ethers with compounds of platinum group metals, however, in the literature we have not found any information on the conditions of complexation of the ligand L with the compounds of rhodium(III) or dirodium(II).…”

“…In this work, continuing a series of research on the interaction of transition elements with macrocyclic compounds, we studied the complexing ability of RhCl 3 ·3H 2 O (I) and [RH 2 (CH 3 COO) 4 ·2H 2 O] (II) with a derivative of dibenzo-18-crown-6 (DB-18-CR-6) containing two diethoxyphosphoryl groups as substituents in the benzene rings in the trans position, the trans-4,4'-bis(diethoxyphosphoryl)biphenyl-18-crown-6 (L) [3][4][5].…”

“…Compound I in the solid state is a mixture of polymers of general formula (H 3 O) 3 Rh n Cl 3n+3 ·H 2 O, it has acidic properties and dissociates in weakly acidic and neutral media [11], and therefore a possibility of the formation of the H 3 O + ion cannot be excluded.…”