The reaction of hexachlorophosphazene, P 3 N 3 Cl 6 , with SO 3 and the gold halides AuCl 3 and AuBr 3 , respectively, leads to the new cyclic anionic tetramer, [S 4 N 2 O 10 ] 2À , which is coordinated to Au 3 + in the dimeric complexes [Au 2 X 2 (S 4 N 2 O 10 ) 2 ] (X=Cl, Br). The [S 4 N 2 O 10 ] 2À anion can be seen as the condensation product of two sulfate anions, [SO 4 ] 2À , and two amidosulfate anions, [NH 2 SO 3 ] À .
The solvent adducts of the tetravalent actinoid chlorides ThCl 4 and UCl 4 have been isolated with methanol as [ThCl 4 (MeOH) 4 ] 1 and [UCl 4 (MeOH) 4 ] 2, and with ethanol as [ThCl 4 (EtOH) 4 ] 3 and [UCl 4 (EtOH) 4 ] 4. In hydrochloric acid [ThCl 2 (H 2 O) 7 ](Cl) 2 (H 2 O) 2 5 forms, which is isotypic to the known [UCl 2 (H 2 O) 7 ](Cl) 2 (H 2 O) 2 6. The adducts have been analysed using SXRD, IR, CHN, TGA-MS and PXRD. The material can be isolated from saturated organic (1-4) or acidic aqueous (5-6) solutions, however, drying of the isolated material results in loss of HCl and the formation of oxide species, confirmed by the isolation of U 3 O 8 after complete thermal decomposition.
The Front Cover shows that there are occasions on which chemistry shows its human face. Thorium(IV) and uranium(IV), both of which share a love for chloride, saturate themselves quite literally when given the opportunity to take up some alcohol or water, i.e. polar‐protic solvents. When either ThCl4 or UCl4 is treated with methanol or ethanol, the molecular solvent adducts [ThCl4(MeOH)4], [UCl4(MeOH)4], [ThCl4(EtOH)4] and [UCl4(EtOH)4] form. The tendency to form the water adduct is so strong that, when a Th adduct is dissolved in hydrochloric acid, two Th−Cl bonds break up and [ThCl2(H2O)7](Cl)2(H2O)2, which is isotypic with the already known [UCl2(H2O)7](Cl)2(H2O)2, forms. At elevated temperature, the materials decompose to form their respective oxides. More information can be found in the Research Article by M. Zegke and co‐workers.
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