Silver(II) Fluorosulfate: A Thermally Fragile Ferromagnetic Derivative of Divalent Silver in an Oxa‐Ligand Environment

Abstract

] in a structure type related to that of AgF 2 . Puckered [Ag(SO 3 F) 2 ] sheets are present in the crystal structure with two oxygen atoms of the fluorosulfate anions utilized for bonding within the sheet; the third oxygen atom serves as a linker to the adjacent sheet. Terminal fluorine atoms form small cavities in the structure. The S-O stretching region of the vibrational (IR and Raman) spectra is rich in bands, thus confirming the structural complexity of Ag(SO 3 F) 2 . Ag(SO 3 F) 2 is a soft ferromagnet with a Curie temperature of 24.8 K and it shows a single broad electron spin resonance (ESR) with g = 2.183 at T = 293 K. The intrasheet magnetic superexchange constant, J, derived from

Ag3(SO3F)4: A Rare Example of a Mixed‐Valent AgII/AgI Compound Showing 1D Antiferromagnetism

“…[23] III. AgSO 3 F Ǟ / AgF + SO 3 (8) The observed values of mass loss for both steps of thermal decomposition are much smaller than the theoretical values given above. The discrepancies indicate that the complex process of thermal decomposition is not completed at 500°C (as clearly seen from the TGA profile) and it involves parallel processes that overlap on the temperature scale.…”

“…Soft restrictions on bond lengths and angles of the SO 3 F -anions were applied as described before. [8] The structure of Ag I 2 Ag II -(SO 3 F) 4 was solved by using Jana2006 [9] combined with Expo2004, [10] which provided the starting model for the refinement. [12] for Ag I a [1.10(3)] is larger than that for Ag I b [0.99(2)].…”

“…As expected, Ag 3 (SO 3 F) 4 is a Mott-Hubbard insulator, in contrast to Ag II (SO 3 F) 2 (a charge-transfer insulator). [8] Introduction of the MottHubbard U is not necessary, however, to open the band gap at the Fermi level (Figure 7). A small direct electronic band gap of approximately 0.35 eV appears at (1/2 0 0) even in the LSDA calculations but it increases to ca.…”

“…At 2.6 K a complex fine structure develops, reminiscent of that for a paramagnetic specimen ( Figure 5) but very different from the one measured at 2.6 K for Ag(SO 3 F) 2 . [8] Since all Ag II atoms are equivalent in the cell, a fine structure is due to either a rhombic g tensor [recollect a (2+2+2) coordination of Ag] or even due to the coupling between electronic and nuclear spins.…”

Chitosan‐Templated Synthesis of Few‐Layers Boron Nitride and its Unforeseen Activity as a Fenton Catalyst

“…Our recent studies of metal fluorosulfate derivatives have focused on the analysis of the crystal structures of model binary systems1,2,9 as well as on the magnetic properties of highly‐oxidizing Ag II compounds 9,12. Silver(II) fluorosulfate, studied previously by Aubke et al,13 exhibits a puckered‐sheet structure with square‐planar Ag II centers.…”