“…A considerable number of covalently bonded main-group derivatives of the F 2 OSN- ligand are known as exemplified by XNSOF 2 (X = H, F, Cl, Br, I, (CH 3 ) 3 Si, CH 3 OS(O), CF 3 CO, CF 3 S, OCNSO 2 , Cl 3 PNSO 2 , OCNCO, (C 6 H 5 ) 4 As, (C 6 H 5 ) 4 P, OPF 2 , OPFCl, OPCl 2 , SPCl 2 , (CH 3 ) 2 SnCl, (CH 3 ) 2 SnBr), − X(NSOF 2 ) 2 (X = (CH 3 ) 2 Si, (C 6 H 5 )CH 3 Si, OS, OSe, O 2 S, OPF, OPCl, SPCl, SPF, (CH 3 ) 2 Sn), − X(NSOF 2 ) 3 (X = B, P, As, Sb, CH 3 Si, OP, SP), − (NCNSOF 2 ) 3 , [B(NSOF 2 ) 4 ] − , Si(NSOF 2 ) 4 , and Sb(NSOF 2 ) 5 . , Examples of transition metal derivatives include Hg(NSOF 2 ) 2 , AgNSOF 2 , Re(CO) 5 (NSOF 2 ), [(CO) 4 M(NSOF 2 )] 2 (M = Re, Mn − ), M(NSOF 2 ) 2 (M = Ni, Co, Cu), Cu(NSOF 2 )(AsF 5 NSOF 2 ), [Ni(SO 2 ) 2 ][AsF 4 (NSOF 2 )] 2 , as well as the [Ag(NSOF 2 ) 2 ] − and [M(NSOF 2 ) 4 ] 2– anions (M = Zn, Hg, Mn, Co, Pd, Cu). , Their structural characterizations have been limited to IR and/or Raman spectroscopy, NMR spectroscopy, electron diffraction, and mass spectrometry. The only F 2 OSN- derivatives that have been characterized by single-crystal X-ray diffraction are (NCNSOF 2 ) 3 , [Ni(SO 2 ) 2 ][AsF 4 (NSOF 2 ) 2 ] 2 , and [(CO) 4 Mn(NSOF 2 )] 2 . , In the case of (NCNSOF 2 ) 3 , the trimeric structure is comprised of an s -C 3 N 3 ring in which the F 2 OSN- groups are bonded to carbon .…”