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Urea? *data for ICSD #24655 Coll Code 24655 Rec Date 1980/01/01 Mod Date 2007/08/01 Chem Name Urea Structured C O (N H2)2 Sum C1 H4 N2 O1 ANX AXY2 Min Name Urea D(calc) 1.32 Title The structure of urea. Interatomic distances and resonance in urea and related compounds Author(s) Vaughan, P.;Donohue, J. Reference Acta Crystallographica (1,1948-23,1967) (1952), 5, 530-535 Unit Cell 5.661 5.661 4.712 90. 90. 90. Vol 151.01 Z 2 Space Group P -4 21 m SG Number 113 Cryst Sys tetragonal Pearson tP16 Wyckoff e c2 R Value .099 Red Cell P 4.712 5.661 5.661 90 90 90 151.005 Trans Red 0.000 0.000 1.000 / 1.000 0.000 0.000 / 0.000 1.000 0.000 Comments R(without H)=0.11, H-positions not given AE: C: N2 O; O: C; N: C H2; isolated molecules Electron structure calculation Compound with mineral name: Urea The structure has been assigned a PDF number (calculated powder diffraction data): 01-073-2106 The structure has been assigned a PDF number (experimental powder diffraction data): 28-2015 Structure type prototype : Urea Structure type : Urea X-ray diffraction from single crystal Position of 8 Elements of H Are Undetermined. Atom # OX SITE x y z SOF H C 1 +4 2 c 0 0.5 0.3308(30) 1. 0 O 1 -2 2 c 0 0.5 0.5987(20) 1. 0 N 1 -3 4 e 0.1429(20) 0.6429(20) 0.1848(18) 1. H2 Lbl Type B11 B22 B33 B12 B13 B23 C1 C4+ 3.9 3.9 1.9 0 0 0 O1 O2- 3.9 3.9 1.9 0 0 0 N1 N3- 3.9 3.9 1.9 0 2.8 2.8 *end for ICSD #24655 |

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