Catechol effected dissolution of silicate minerals [report]

James Kelley
2000 unpublished
The chemical properties of guanidinium tris(catechola to)siliconate, (H2N)2C=NH2J2(Si(C6H402)j]-XH20 (0 <X ~l), precipitated from an ammoniacal solution of silica and cate chol by adding gUanidinium hydrochloride, (H2N)2C=NH.HCl, were studied, and infrared, nmr, x-ray powder diffraction, and analytical data were gathered. This same compound was, upon addition of' (H2N)2C=NH.HC1, isolated from 0.2, M aqueous catechol solutions buffered at pHlO and containing the silicate minerals albite,
more » ... als albite, andradite, muscovite, pyrophyllite, talc, and wollastonite, and also trom unbuffered catechol solutions containing wollastonite and andradite. 2 It is concluded from this work that the formation of an anionic catechol-silicon complex, Si(C6H402)32~ is largely responsible for the dissolution of the minerals mentioned above. From this conclusion, it is proposed that naturally occurring members of the class of organic com pounds to which catechol belongs, the aromatic vic-diols, may playa role in chemical weathering, in the development of certain soil profiles, and in the entry and accumulation of silica in plants.
doi:10.15760/etd.970 fatcat:sukht4a6gfca5i2wnd5746qkua