铅化物的原子价有+ 2和+ 4价，其中铅氧化物(密陀僧)是最广为使用的。
Lead in compounds has valence 2 and 4; an oxide (litharge) is the most widely used.
尽管通常的价键理论可加以扩展以适用于这些化合物，但仍然有许多棘手的问题有待解决。
Although the usual bonding theories can BE extended to accommodate these compounds, they still provide stimulating problems to BE resolved.
结果显示配合物3有四边形孔穴的结构，荧光性能显示可以探测二价镁离子。
The results show: complex 3 have a square-like hole and may be employed in probing Mg~(2+) for use in fluoroimmunoassays.
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