[structure: see text] Ferrocene compounds bearing multiple amido groups selectively bind with the H(2)PO(4)(-) ion over other anions. The one-arm receptors form 1:1 complexes with the H(2)PO(4)(-) ion, whereas the two-arm receptors can accommodate two H(2)PO(4)(-) ions. The complexation modes and binding strengths are deduced from the NMR, calorimetry, fluorescence, and cyclic voltammetry studies. The two-arm ferrocene hexamide receptors likely exist in synclinal conformations to incorporate tetrahydrofuran molecules and H(2)PO(4)(-) ions.

The high-energy part of the proton spectrum at 4° from the reaction D (n,p)2n at 14.4 Mev has been analyzed using the final-state interaction formalism, taking into account only the n -n interaction in the final state. The primary interaction has been calculated in a kind of Born approximation. It has been shown that the shape of the high-energy part of the proton spectrum is dependent mostly on the n-n scattering length, a nn , and that by varying a nn , a good fit to the shape of this part of the spectrum is obtained. From this analysis, a value of a nn -( -22±2)f has been obtained. However, this value of a nn is to some extent dependent on the accuracy of the approximations used. A more refined theoretical treatment would therefore be desirable.

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Phys» Rev 0 110, 594 (1958) 0 7 J 0 Do Seagrave, Phys. Rev. £7, 757 (1955). 8 W 0 Heckrotte and M 0 MacGregor, Phys, Rev 0 111, 593 (1958) o 9 V. Vo Komarov and A. JM 0 Popova, J. Exptl.