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By Sherman H. C.

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Extra info for An Investigation of the Chemical Nature of Two Typical Enzymes Pancreatic and Malt Amylases

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Perhaps the most significant application has been in elucidating important aspects of the structure of the iron(II) SCO linear polymers derived from 1,2,4-triazoles [56]. EXAFS has also been applied to probe the dimensions of LIESST-generated metastable high spin states [57]. It has even been used to generate a spin transition curve from multi-temperature measurements [58]. X-ray absorption spectroscopy (XAS) can be divided into EXAFS and Xray absorption near edge structure (XANES), which provides information essentially about geometry and oxidation states.

14) to the Prussian blue type systems is a very significant development and offers exciting prospects for further electronic switching mechanisms [263]. A somewhat related and novel association of spin crossover and intervalence electron transfer has highlighted a potential new sphere of interest [264]. Alvarez has drawn attention to the crystallisation of certain SCO substances in enantiomorphic space groups and has noted that this opens the way for new studies exploiting the chirality of the metal coordination centres in many instances [53].

The majority of the monomeric systems have the cis configuration of the anionic groups, which would be favoured because of the steric interference from the hydrogen atoms of the two diimine species if they coordinated in a plane [95]. trans-Dianion monomeric structures are known but in these the diimines contain at least one coordinating five-membered heterocycle. The steric effects noted above for the trans arrangement are reduced considerably when five-membered rings are present because of their particular geometry.

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