Linear Heterometallic Co3Li2 and Co4Li2 Siloxides: Precursors for the Plasma Synthesis of Adsorbent Materials

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Abstract

New linear heterometallic Co3Li2 and Co4Li2 arrays have been assembled with the use of disiloxanediolate and silsesquioxane ligands. Treatment of anhydrous CoCl2 with in situ-prepared (Ph2SiOLi)2O afforded (thf)Co[Co{μ-(Ph2SiO)2O}{(μ-Cl)2Li(thf)2}]2 (5) as dark blue prisms in 73 % yield, while the analogous reaction of CoCl2 with in situ-prepared Cy7Si7O9(OLi)3 (Cy = cyclohexyl) gave royal blue [Co2(μ-Cy7Si7O12)(μ-OSiMe3)(μ-Cl){Li(thf)2}2]2 (6) in 68 % yield. Both of the new compounds have been structurally characterized by X-ray crystallography. Plasma treatment of 5 was found to activate the surface by creating –C–O, –C=O, and –COO functionalities. An initial study revealed promising formaldehyde adsorption properties for the plasma-treated material 5a.

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