Strontium alkoxides synthesis

Strontium, aquatetrakis(diacetamide)-structure, 1,98 Strontium, heptaaqua-dodecaiodide structure, 1, 72 Strontium, octaaqua-structure, 1, 84 Strontium alkoxides synthesis, 2,336 Strontium complexes porphyrins, 2, 820 pyridine oxide, 3, 9 Structure... 

The hydrolysis of a mixture of metal alkoxides forms a fairly successful route for the synthesis of complex oxide powders (67). However, most metal alkoxides are expensive, and their hydrolysis requires carefully controlled conditions because of their sensitivity to moisture. The controlled hydrolysis of a mixture of salt solutions appears to be more difficult, but its use has been demonstrated by Matijevic (61) for a few systems, including barium titanate and strontium ferrite. 

Interest in the synthesis and structural characterisation of less common metalloorganophosphide systems has continued. A range of alkali metal complexes of the phosphide anion (48) has been prepared from the lithio-phosphide by simple metathesis with alkali metal alkoxides. The lithio-phosphide exists as a dimer, but crystallisation of the sodium and potassium drivatives in the presence of TMEDA results in the formation of monomeric species. The caesium triphosphenide (49), involving a phosphorus analogue of the allyl anion, has been prepared from the previously described sodium complex. Unlike the sodium and potassium complexes, which are monomeric, the caesium complex has a polymeric structure. A variety of arylphosphide complexes of magnesium, calcium, strontium and barium have been prepared and their solid state structures characterised. Cop-per(I)-, silver(I)- and gold(I)-complexes of the cyclo-(P ion have also... 

Drake S.R., Streib W.E., Chisholm M.H., Caulton K.G. Pacile synthesis and structural principles of the strontium phenoxide Sr4(OPh)g(PhOH)2(THF)6. Inorg. Chem. 1990 29 2707 Drake S.R., Streib W.E., Foiling K., Chisholm M.H., Caulton K.G. Dinuclear barium alkoxides and siloxides displaying variable coordination numbers and asymmetric dispositions ofligands. Inorg. Chem. 1992 31 3205... 

Since alkoxides of low formal charge metals are highly condensed and therefore poorly reactive, the synthesis of many perovskites (ticanium. zirconium, niobium, barium, strontium or lead) can take place by hydrolysis of the alkoxide by an aqueous suspension of hydroxide (Ba, Sr) [121] or by an aqueous solution of a lead complex such as the acetate [122]. Iron is introduced as acetylacetonate in the case of PbFeo.jNbo.sOi [123]. The calcination temperature varies with the nature of the metallic cation. It must be adjusted if the formation of undesirable phases is possible, such as the pyrochlore phase in the case of PbMgo.33Nbo.66O3 and PbZri, (Ti 03 [122]. A fast ramp rate prevents or minimizes its formation. 

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