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

zeitschrift für kristallographie - crystalline materials

New hybrid diphosphates  Ln  2 (NH 2 (CH 2 ) 2 NH 2 )(HP 2 O 7 ) 2  · 4 H 2 O( Ln  = Eu, Tb, Er): synthesis, single crystal and powder X-ray crystal structure