New hybrid diphosphates Ln 2(NH2(CH2)2NH2)(HP2O7)2 · 4 H2O(Ln = Eu, Tb, Er): synthesis, single crystal and powder X-ray crystal structure

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Abstract
Crystals of lanthanide ethylenediamine diphosphates Ln(2)(NH2(CH2)(2)NH2)(HP2O7)(2) (.) 4H(2)O (Ln = Eu (1), Tb (2), Er (2)) have been synthesized and investigated by single crystal X-ray diffractometry (Eu and Th phases) and by powder X-ray diffractometry (Er phase). The three structures resulted to be isostructural within triclinic space group P1, with unit cell parameters of a = 6.5050(6) angstrom; b = 6.9990(2) angstrom; c = 9.8450(9) angstrom; alpha = 81.548(5)degrees; beta = 80.631(19)degrees; gamma = 88.369(9)degrees; V = 437.44(6) angstrom(3), (1), a = 6.4360(7) angstrom; b = 6.9480(12) angstrom; c = 9.816(4) angstrom; a = 81.987(19)degrees; beta = 80.595(16)degrees; gamma = 88.591(13)degrees; V = 428.82(19) angstrom, (2), a = 6.39658(2) angstrom; b = 6.86682(2) angstrom; c = 9.78849(3) angstrom; alpha = 81.6811(4)degrees; beta = 80.2304(3)degrees; gamma = 88.3812(3)degrees; V = 419.255(3) angstrom(3) (3). The three-dimensional network is built up by the repetition of ab-parallel layers of LnO(8) polyhedra comer-sharing with (HP2O7) groups; ethylenediarnine molecules lie between such layers, acting both as receptors and donors in strong hydrogen bonds which assure the stabilizing of the entire framework.