142903-49-9Relevant articles and documents
o-Phenylenediamine and Related Complexes of Chromium, Vanadium and Manganese
Redshaw, Carl,Wilkinson, Geoffrey,Hussain-Bates, Bilquis,Hursthouse, Michael B.
, p. 1803 - 1812 (2007/10/02)
Using the ligands (L-L) o-phenylenediamine, 4,5-dimethyl-o-phenylenediamine and phenanthrene-9,10-diamine, anionic chromium(III) complexes of the type -, have been isolated as quaternary phosphonium salts from interaction of CrCl3(thf)3 (thf = tetrahydrofuran) and the ligand in the presence of Cl or Cl.Interaction in the presence of quaternary phosphonium salts gives Cl.A similar tetrachloro anion has been obtained using the chelating phosphine 1,2-(HPr1P)2C6H4.Similar complexes obtained from VCl3(thf)3 have the form - and Cl.Use of the dihalides leads to octahedral complexes trans-MCl2(L-L)2 (M = V or Cr) and trans-MnI2(L-L)2.The interaction of > with AgO3SCF3 and of 2>Cl with trifluoromethanesulfonic acid and diethyl ether leads to the unusual chromium(IV) octahedral triflate compounds Cr(NH2)(O3SCF3)3 and Cr(O3SCF3)4, respectively.The crystal structures of the compounds >, Cr(NH2(O3SCF3)3, Cr(O3SCF3)4 and > have been determined.All have octahedral structures with chelating diamines.In the tetrachlorochromate(III) salt, the Cr-N distances are ca. 0.05 Angstroem longer than those in the chromium(IV) compounds.The VIII-N distances are ca. 0.05 Angstroem longer than the CrIII-N distances , as expected, but the vanadium complex shows a much greater difference in M-Cl distances trans to N or trans to Cl than in the chromium(III) complex .
