5 research outputs found
Mass spectrometry of metal compounds: II-mass spectrometric studies of [CF<SUB>3</SUB>EMn(CO)<SUB>4</SUB>]<SUB>2</SUB>, [CF<SUB>3</SUB>EFe(CO)<SUB>3</SUB>]<SUB>2</SUB> (E = S, Se), CF<SUB>3</SUB>SeFe(CO)<SUB>2</SUB>C<SUB>5</SUB>H<SUB>5</SUB> andCF<SUB>3</SUB>SCr(NO)<SUB>2</SUB>C<SUB>5</SUB>H<SUB>5</SUB>
The electron impact induced mass spectra of
[CF3SMn(CO)4]2, [CF3SeMn(CO)4]2,
[CF3SFe(CO)3]2, [CF3SeFe(CO)3]2,
CF3SeFe(CO)2C5H5 and
CF3SCr(NO)2C5H5 are reported. These compounds exhibit
weak molecular ion peaks and undergo preferential loss of CO or NO groups. The CO or NO free
fragments suffer typical loss of ECF2(E = S, Se) with the simultaneous shift of F from
carbon to metal. The ions [FFeC5H5]+ and
[FCrC5H5]+ in the spectra of the cyclopentadienyl compounds prefer
expulsion of π-cyclopentadienyls. The pyrolysis effects on the spectra of the compounds have
been studied. An increase in temperature eases the expulsion of ECF2 groups from all the
compounds and favors the formation of [Fe(C5H5)2]+ and
[Cr(C5H5)2]+ in the cyclopentadienyl
compounds
An External Beam Irradiation System for Trace Elemental Determination in Liquids
An external beam irradiation facility for direct trace elemental analysis of liquid samples has bean developed at the Variable Energy Cyclotron Centre, Calcutta. The system has been standardized primarily for transition metals, in liquid samples. The system has been found to behave lineraly over a wide range of concentrations. The minimum detection limits (MDL ) were found in the order of 15 -160 ppm in presence of interfering elements and 0.6 -10 ppm in the absence of interfering elements The results were validated by analysing NIST standards