Refinement of disodium dithionate dihydrate

Sulfite solutions for conversion of iron hydrate wastes formed at copper-nickel industries

“…Iron(II) sulfate, sodium sulfate, and sodium dithionate were found in solution. It is of interest to note that the structure of the dithionate recovered from the liquid phase coincides with that reported in [9], where the existence of the S-S bond in the Na 2 S 3 O 6 molecule is noted. This fact provides a fresh look on the mechanism of the redox process occurring in conversion of the ferrous cake because sulfur atoms are also bound in the pyrosulfi te ion by the S-S bond.…”

X-ray diffraction study of Na2S2O6.2H2O and Na2S2O6.2D2O

“…Recently we became aware of a similar structure refinement on NAH by Kiers, Piepenbroek & Vos (1978).…”

SO2 Activation by the Bis(guanidinato)silylene [iPrNC(NiPr2)NiPr]2Si: Formation of Neutral Six‐Coordinate Silicon(IV) Complexes with a Chelating Sulfito or Dithionito Ligand

“…These strong (2)], Si-N4 1.8994 (19) [1.8784 (19)], Si-N5 1.888(2) [1.899(2)], S1-S2 2.3296(11) [2.3436(11)], S1-O1 1.5645(17) [1.5684(17)], S1-O3 1.408 (2) (8)], S2-S1-O1 93.26 (7) [93.17 (7)], S2-S1-O3 106.42 (11) [103.38(9)], O1-S1-O3 113.76 (12) [110.65 (11)], S1-S2-O2 93.70 (6) [92.66 (7)], S1-S2-O4 103.8 (5) (7) Å] and are also similar to those of the dithionite dianion of Na 2 S 2 O 4 (2.389 Å) [15] and ZnS 2 O 4 ·pyridine [2.386(2) Å]. [16] Interestingly, these S-S bond lengths also compare with those reported for molecular complexes of Sn II , Yb III , and U IV with bridging tetradentate dithionito ligands [2.346(2)-2.413(4) Å]. [14] The endocyclic N1-C1, N2-C1, N4-C14, and N5-C14 distances [1.331(5)-1.350(3) Å] and exocyclic N3-C1 and N6-C14 distances of 12 and 13 [1.366(3)-1.382(5) Å] are very similar and shorter than that of a standard N-C single bond, and the sum of the respective N-C-N angles is 360°, indicating an electron delocalization over the N 3 C skeletons of the bidentate guanidinato ligands.…”

“…1 H NMR (CD 2 Cl 2 ): δ = 1. 16 29 Si{ 1 H} NMR (CD 2 Cl 2 ; data for two isomers, cis/trans ratio 4.32:1): δ = -159.0 (cis), -147.2 (trans) ppm. 15 N VACP/MAS NMR (separated resonance signals for the two crystallographically independent molecules observed by single-crystal X-ray diffraction could not be resolved; data for two isomers, cis/trans ratio 1:4.55): δ = -302.6 (cis, trans), -299.6 (trans), -297.7 (cis), -285.6 (trans), -284.8 (cis), -235.4 (cis, trans), -232.0 (cis, trans), -231.1 (cis, trans) ppm.…”