Crown Ether Supported Alkali Metal Phosphides: Synthesis, Structures and Bonding.

While 1 Li (−17.4 ppm) and 1 Na (−17.7 ppm) show very similar shifts in the 31 P{ 1 H} spectrum, a clear trend toward low‐field shifted resonances δ 31P (ppm) = −6.6 ( 1 K ), −3.3 ( 1 Rb ), and 1.5 ( 1 Cs ) can be observed for the heavy alkali metal phosphides (Figure 6 ).

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