There is great interest in transition metal complexes containing the trifluoro-

Question

There is great interest in transition metal complexes containing the trifluoro- methyl (CF3) ligand. The [Pt(CF3)32_ complex 1, as its NBu4+ salt, was oxidized with a stoichiometric amount of chlorine gas at-78°C to give complex 2, which on the basis of its elemental analysis appeared to be [Pt(CF3) Cls]P Such a complex could be either of the diastereomers 2a, 2b pictured below CF, . 3". CF3 Cl2 Pt CF3 Cl C 2b The 19F nmr spectrum of complex 2 is reproduced below and consists of two main signals: a septet at -23.5 ppm and a quartet at -33.4 ppm, in a 1:2 integrated ratio. 19F nmr 33.4 ppm -23.5 ppm -23.00 23.50-24,00 32.90 -33.4O 33.90

Explanation / Answer

Sol . In 2a all the CF3 are equivalent so in 19F we will get only one singlet peak but in 2b
there are two types of fluorine so we shall get two peaks in which one is septet (due to six fluorine in equatorial fluorine) of axial fluorine and one quartet ( due to three axial fluorine) of equatorial fluorine so NMR is of structure 2b.

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