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The crystal structures of the four synthetic double salt compounds K 2 Mn(SO 4 ) 2 ·2H 2 O (space group  P 1̅, no. 2,  Z  = 2,  a  = 6.574(1),  b  = 7.332(1),  c  = 10.700(1) Å,  α  = 72.89(1),  β  = 73.91(1),  γ  = 69.77(1)°,  V  = 453.6(1) Å 3 ) and K 2 Cd(SeO 4 ) 2 ·2H 2 O(space group  P 1̅, no. 2,  Z  = 2,  a  = 6.625(1),  b  = 7.542(1),  c  = 11.349(1) Å,  α  = 72.17(1),  β  = 74.55(1),  γ  = 70.13(1)°,  V  = 499.3(1) Å 3 ) as well as (NH 4 ) 2 Cu(SeO 4 ) 2 ·2H 2 O (space group  P 1̅, no. 2,  Z  = 1,  a  = 5.784(1) Å,  b  = 7.107(1) Å,  c  = 7.371(1) Å,  α  = 104.21(2)°,  β  = 93.04(2)°,  γ  = 112.27(2)°,  V  = 268.19(7) Å 3 ), and KFeH(SO 4 ) 2 ·2H 2 O(space group  P 1̅, no. 2,  Z  = 1,  a  = 4.626(1),  b  = 5.820(1),  c  = 8.265(1) Å,  α  = 103.86(1),  β  = 99.77(1),  γ  = 95.66(1)°,  V  = 210.64(2) Å 3 ) have been determined from single-crystal X-ray diffraction data collected with a CCD area detector at 293 K, and were refined to  R ( F ) = 0.0231, 0.0251, 0.0230 and 0.0194, respectively. The first two compounds are isostructural. The atomic arrangements are described, with a focus on the hydrogen bonding. All compounds contain kröhnkite [Na 2 Cu(SO 4 ) 2 ·2H 2 O]-type tetrahedral-octahedral chains but show different topological arrangements of these chains. A classification is proposed in an accompanying paper. A particular feature of KFeH(SO 4 ) 2 ·2H 2 O is a disordered H atom involved in a short hydrogen bond, which shows no ordering down to 110 K.

zeitschrift für kristallographie - crystalline materials

Crystal structures of the double salt dihydrates K 2 Cd(SeO 4 ) 2 ·2H 2 O, K 2 Mn(SO 4 ) 2 ·2H 2 O, (NH 4 ) 2 Cu(SeO 4 ) 2 ·2H 2 O and KFeH(SO 4 ) 2 ·2H 2 O