首页> 外文期刊>Acta Crystallographica, Section B. Structural science, crystal engineering and materials >Bond-length distributions for ions bonded to oxygen: results for the lanthanides and actinides and discussion of the f-block contraction
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Bond-length distributions for ions bonded to oxygen: results for the lanthanides and actinides and discussion of the f-block contraction

机译:与氧键合的离子的键长分布:镧系元素的结果和散裂和F-块收缩的讨论

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摘要

Bond-length distributions have been examined for 84 configurations of the lanthanide ions and 22 configurations of the actinide ions bonded to oxygen, for 1317 coordination polyhedra and 10 700 bond distances for the lanthanide ions, and 671 coordination polyhedra and 4754 bond distances for the actinide ions. A linear correlation between mean bond length and coordination number is observed for the trivalent lanthanides ions bonded to O~(2-). The lanthanide contraction for the trivalent lanthanide ions bonded to O~(2-) is shown to vary as a function of coordination number, and to diminish in scale with an increasing coordination number. The decrease in mean bond length from La~(3+) to Lu~(3+) is 0.25 ? for coordination number (CN) 6 (9.8%), 0.22 ? for CN 7 (8.7%), 0.21 ? for CN 8 (8.0%), 0.21 ? for CN 9 (8.2%) and 0.18 ? for CN 10 (6.9%). The crystal chemistry of Np~(5+) and Np~(6+) is shown to be very similar to that of U~(6+) when bonded to O~(2-), but differs for Np~(7+).
机译:已经研究了粘结长度分布的镧系元素离子的84个配置和粘合到氧的致动离子的结构的构型,对于1317个配位Polyhedra和Lanthanide离子的10 700键距离,以及671个配位Polyhedra和4754个粘合距离的致动力 离子。 对于键合至O〜(2-)的三价镧系元素,观察到平均键长度和配位数之间的线性相关性。 键合至O〜(2-)的三价镧系元素的镧系元素被显示为与配位数的函数变化,并以增加的配位数逐渐减少。 从La〜(3+)到Lu〜(3+)的平均键长度的降低为0.25? 对于协调数量(CN)6(9.8%),0.22? 对于CN 7(8.7%),0.21? 对于CN 8(8.0%),0.21? 对于CN 9(8.2%)和0.18? 对于CN 10(6.9%)。 NP〜(5+)和NP〜(6+)的晶体化学显示与键合到O〜(2-)时与U〜(6+)的晶体化学相似,但是NP〜(7+ )。

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