Geometry, change with number

The Heat of Adsorption Detector, devised by Claxton (16) in 1958 has been Investigated by a number of workers (17,18,19) but although once commercially available, has not been extensively employed as an LC detector. One reason for this is the curious and apparently unpredictable shape of the temperature-time curve that results from the detection of the usual Gaussian or Poisson concentration peak profile. The shape of the curve changes with detector geometry, the operating conditions of the chromatograph, the retention volume of the solute and for closely eluted peaks, it produces a complex curve that is extremely difficult to interpret. 

Fig. 16.56 Structures of osmium complexes which hove seven pairs of skeletul electrons. Each copped triangular face adds twelve electrons to the total electron count, but the number of skeletal pairs remains seven. Likewise removing OstCOlj deletes twelve electrons without changing the number of skeletal pairs. The diagonal lines show alternate geometries with the same total number of electrons [From McPanlm. M Poh-kednm IWM.J. 2 9 Reproduced with permission.)...

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