作者:D. Udayakumar、Meenakshi Dan、C. N. R. Rao
DOI:10.1002/ejic.200300818
日期:2004.4
Although a few open-framework metal sulfates and selenites have been synthesized and characterized recently, it has not been possible to prepare the corresponding selenates, probably because of the instability of the +6 oxidation state of Se in alkaline media. We have been able to synthesize, for the first time, organically templated open-framework rare earth selenates with the general formula 0.5[
尽管最近已经合成并表征了一些开放骨架金属硫酸盐和亚硒酸盐,但尚无法制备相应的硒酸盐,可能是因为硒在碱性介质中的 +6 氧化态不稳定。我们首次能够合成通式为 0.5[C2N2H10][Ln(H2O)2(SeO4)2] (I)(Ln = La、Nd 或 Pr)的有机模板化开放框架稀土硒酸盐) 和 0.5[C4N2H14][La(SeO4)2]·0.5H2O (II),在酸性介质中的水热条件下。晶体数据: I (Ln = La): 三斜晶系,空间群 = P , Mr = 491.91, a = 7.0105(8) A, b = 7.3772(9) A, c = 9.526(1) A, α = 82.014(2) ), β = 84.514(2), γ = 84.247(2)°, V = 483.76(1) A3, Z = 2; II: 三斜, 空间群 = P , Mr = 478.91, a =