On the Crystal Structures of FeOHSO4 and InOHSO4.

Supramolecular Complexation of Polynuclear Aqua Ions: A Crown Ether Adduct of aμ-Oxo-Bridged Iron(III) Aqua Dimer

“…Further variable-temperature studies on single crystals of 1 are warranted to elucidate the antiferromagnetism of the excited state. A weaker broad band at 799 nm is assigned to the d ± d band 6 A 1 A 4 T 1 , which gains intensity from the low energy LMCT bands and from the covalent Fe-O-Fe bond. [14] In the molecular structure of 1, the bridging oxo ligand lies on a twofold rotation axis (Figure 1).…”

“…[6] All other permeants and chemicals were obtained from Aldrich or Mallinckrodt. Films were prepared by the slow evaporation of a drop hanging from a glassy carbon disk electrode spinning at % 100 rpm.…”

“…Previous X-ray structural studies on binuclear aqua ions of Al III , [6] Cr III , [7] Sc III , [8] and Rh III , [9] as well as on a heterometallic Cr III Rh III aqua ion, [10] showed that the bis(m-hydroxo)M 2 core is preferred in all these cases. However, the existence of a moxo-bridged Cr III dimer was proposed on spectroscopic grounds.…”

“…However, the existence of a moxo-bridged Cr III dimer was proposed on spectroscopic grounds. With the exception of the Al III dimer, [6] aromatic sulfonates were a key factor in the crystallization of these aqua ions. Such anions assist in the assembly of a superlattice in which layers of aqua ions are separated by layers of the anions.…”

Minerais e equivalentes sintéticos do sistema Fe2-O3-SO3-H2O

“…° produto Fe(OH)(S04) ou Fe:z03 ' 2S03.H20 também foi sintetizado e seu campo de estabilidade estende-se, segundo Posnjak & Merwin (1922), de 75°C até temperaturas superiores a 3OO"C. De acordo com Walter-Uvy & Quéméneur (1968), esta substância mantém-se estável até 450"C. O mesmo sal, foi estudado por Johansson (1962) Quérnéneur (1966).…”