The hydration enthalpies of Md3+ and Lr3+
The hydration enthalpies of Md3+ and Lr3+
复制标题
Md3 和 Lr3 的水合焓
DOI：
10.1016/s0020-1693(00)80619-2
复制
发表时间：
1988
影响因子：
2.8
通讯作者：
D. Hoffman
中科院分区：
文献类型：
--
作者：
W. Brüchle;M. Schädel;U. Scherer;J. Kratz;K. Gregorich;D. Lee;M. Nurmia;R. Chasteler;H. Hall;R. Henderson;D. Hoffman
用 18 O 离子轰击 a 249Bk 靶标时产生锹 (3-min260Lr) 和较轻的锕系元素，并与放射性镧系元素示踪剂 166Ho、171Er 和 171Tm 一起加载到 pH=4.85 的 0.05 M α-羟基异丁酸溶液中的阳离子交换柱上。在使用 0.12 M α=羟基异丁酸酯溶液（pH=4.85）的洗脱中，三价 Lr 与 Er 示踪剂完全一起洗脱，Md 与 Ho 接近洗脱。根据较轻锕系元素的已知洗脱位置以及与同源镧系元素洗脱位置的预期类比，Lr 的洗脱时间比预期晚得多。根据测量的洗脱位置，计算 Lr3+ 和 Md3+ 的离子半径。半经验模型允许根据离子半径计算水化热，得出 Md3+ 的 ΔHhyd≈-−3654 kJ/mol，Lr3+ 的 ΔHhyd≈-−3685 kJ/mol。
Lawrencium (3-min260Lr) and lighter actinides were produced in the bombardment of a249Bk target with18O ions and loaded onto a cation exchange column in 0.05 M α-hydroxyisobutyrate solution at pH=4.85, together with the radioactive lanthanide tracers166Ho,171Er and171Tm. In elutions with 0.12 M α=hydroxyisobutyrate solution (pH=4.85), trivalent Lr was eluted exactly together with the Er tracer and Md was eluted close to Ho. Lr elutes much later than expected based on the known elution positions of the lighter actinides and the expected analogy to the elution positions of the homologous lanthanides. From the measured elution positions, ionic radii were calculated for Lr3+and Md3+. Semi- empiricalmodels allow the calculation of the heat of hydration from the ionic radii, resulting in ΔHhyd≈-−3654 kJ/mol for Md3+and ΔHhyd≈ -−3685 kJ/mol for Lr3+.