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The interaction in the system Bi(NO 3) 3-K 3HCit-(H 2O + glycerol) was studied by chemical analysis and pH titration over a wide range of ratios between the initial components. Solid phases of the compositions Bi(OH) 3−3xHCit x · nH 2O and KBiCit · H 2O were isolated and investigated by X-ray powder diffraction and differential thermal analyses and IR spectroscopy. The effect of the chemical nature of the alkali metal on the solubility in the system under consideration was demonstrated. [ABSTRACT FROM AUTHOR]

A novel compound, KBi(C6H4O7) · 3.5H2O ( I), has been synthesized in the Bi(NO3)2-K3(HCit) system (HCit3− is an anion of citric acid C6H8O7) at a component ratio ( n) of 8 in a water-glycerol mixture, and its crystal structure has been determined. The crystals are unstable in air. The crystals are triclinic: a = 7.462 Å, b = 10.064 Å, c = 17.582 Å, α = 100.27°, β = 99.31°, γ = 105.48°, V = 1221.2 Å3, Z = 2, space group $$P\bar 1$$ . In the structure of I, asymmetric binuclear fragments [Bi2(Cit4−)2(H2O)2]2− are linked through inversion centers into polymeric chain anions. Ions K+ and crystal water molecules are arranged in channels between the chains. The Bi(1)...Bi(2) distances in the binuclear fragment are 4.62 Å, and the Bi(1)...Bi(1) and Bi(2)...Bi(2) distances between bismuth atoms in the chain are 5.83 and 5.95 Å, respectively. The chains are linked through bridging oxygen atoms of the ligands Cit to form layers. In the centrosymmetric four-membered chelate ring Bi2O2 formed through Bi-O(Cit) bonds, the distances Bi(1)-Bi(1) are equal to 4.55 Å, and Bi(1)-O are 2.66 and 2.84 Å. The Bi-O bond lengths in I are in the range 2.12–3.16 Å. The Cit ligands act as hexadentate chelating/bridging ligands. [ABSTRACT FROM AUTHOR]