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Cadmium perrhenate diureate crystallizes in the monoclinic space group  P 2 1 / c  with  a  = 15.185(3) Å,  b  = 10.257(2) Å,  c  = 7.561(5) Å,  β  = 93.69(2)°,  Z  = 4 and  d calc   = 3.658g · cm −3 . The hydrated cadmium perrhenate is triclinic with space group  P [unk],  a  = 7.828(1) Å,  b  = 8.631(1) Å,  c  = 13.863(1) Å,  α  = 73.34(1)°,  β  = 89.39(1)°,  γ  = 70.42(1)°,  Z  = 4 and  d calc   = 5.119 g · cm −3 . The two compounds are built up of topologically equal but differently oriented and interlinked chains of the type [unk][MT 2 ] φ  2 , M = Cd, T = ReO 4 ,  φ  = Urea and H 2 O respectively. In Cd(ReO 4 ) 2  · 2 Urea they are parallel and linked by H-bonds only while in Cd(ReO 4 ) 2  · 2H 2 O the chains lie in alternating layers with crossed orientation. Both bond valence calculations and low-range Raman spectroscopic measurements and estimate pointed out to a stronger Cd–O Urea  in comparison to Cd–O H 2 O  bonding.

Structure of molecular adducts of inorganic salts. IV. Comparison of the Cd(ReO 4 ) 2 · 2 Urea and Cd(ReO 4 ) 2 · 2H 2 O structures 1