Biochemistry of Silicon and Related Problems by Nils Ingri (auth.), Gerd Bendz, Ingvar Lindqvist, Vera

By Nils Ingri (auth.), Gerd Bendz, Ingvar Lindqvist, Vera Runnström-Reio (eds.)

Silicon chemistry used to be initiated in 1823 by means of Berzelius who ready elemental silicon. in lots of methods silicon was once thought of a regular contrary of carbon, even supposing the 2 components are heavily comparable as to their digital constitution, either having 4 valence electrons. The homes in their compounds are, notwithstanding, severe­ ly diverse. either shape prolonged constructions, yet in numerous methods - carbon via covalent carbon-carbon bonds; silicon by way of polar silicon- -oxygen-silicon bonds. The advanced carbon compounds are fundamental components of all dwelling topic, crops and animals. The corresponding silicon compounds building up a huge a part of useless subject, soils and minerals. As lately as two decades in the past the identify of this Symposium, "BiOChemistry of Silicon", could were regarded as contradictio in adjecto. even though, the improvement within the box has, in the past fifteen years, been overwhelming and has confident us that silicon is an important aspect within the lifestyles tactics, for animals in addition to for crops. fascinating therapeutical makes use of were recommended, yet we've got additionally turn into more and more conscious of severe occupational illnesses - asbestosis and silicosis - and of attainable cancerogenic results. it really is our wish that this quantity will supply a few inspiration approximately numerous points of silicon compounds that have been mentioned through the Symposium.

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Is the complex with catechol: O OH 3 OH H·BONDED COMPLEXES OF SILICA 55 It is not generally appreciated that even quartz will dissolve 1n a neutral solution of ammonium catecholate (~). In (II) there 1S a pair of similarly spaced oxygen atoms as found in I-hydroxy pyridine N-oxide (1). 30 0H NO In both structures the coordination number of silicon has been increased from 4 to 6 and the silicon is in ionically charged complexes. Some such complex ions may be present in tissues where silica is metabolized.

Also, the compounds which associate with the hydrogen atom are those which in chloroform can be shown to evolve heat and show IR changes characteristics of H-bonding. Thus, acetone forms the analogous complexes; and (~) 56 R. K. ILER HYDROGEN BONDS WITH SiOH Once the silicic acid has been transported and released as Si(OH)4 it can polymerize and be built-up into solid structures. It is at this point that the hydrogen-bonding effects of organic molecules may playa role. As far as is known, monosilicic acid does not form hydrogen bonded complexes and the reason may lie in the very low acid strength of the SiOH group.

Furthermore, the impurity level must be kept under exact control so that an OH--consuming impurity can be corrected for. This is absolutely necessary since the impurity level is of about the same order of magnitude as the total silicon concentration. g. amorphous silica or aluminium silicates) in the solution studied. With modern electronic techniques and by simultaneously following up the titrations with digital computation, the mentioned difficulties seem, however, surmountable. In a potentiometric titration study by Bilinski & Ingri (39) this method was applied to an accurate determination of kl' the first dissociation constant.

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