Interatomic distances (in Å) and bond valence sums (BVS) for Na2Mn(SO4)2·4H2O and Na2Ni(SO4)2·10H2Oa.
| Distances (Å) | Distances (Å) | ||
|---|---|---|---|
| Na 2 Mn(SO 4 ) 2 ·4H 2 O | Na 2 Ni(SO 4 ) 2 ·10H 2 O | ||
| Na1–O1 | 2.3831(10) | Na1–O3 | 2.3956(11) |
| Na1–O3 | 2.3952(11) | Na1–O4 | 2.5474(9) |
| Na1–O5 | 2.4111(9) | Na1–O7 | 2.4138(9) |
| Na1–O4 | 2.4490(11) | Na1–O7 | 2.4159(9) |
| Na1–O1 | 2.4623(12) | Na1–O8 | 2.4671(12) |
| Na1–O6 | 2.6162(11) | Na1–O8 | 2.4821(10) |
| 〈dNa1–O〉 | 〈2.4528〉 | 〈dNa1–O〉 | 〈2.4537〉 |
| BVS | b1.06[6] | BVS | b1.04[6] |
| Mn1–O2 (×2) | 2.1475(9) | Ni1–O5 (×2) | 2.0365(8) |
| Mn1–O5 (×2) | 2.1593(9) | Ni1–O6 (×2) | 2.0409(8) |
| Mn1–O6 (×2) | 2.2088(9) | Ni1–O9 (×2) | 2.0892(9) |
| 〈dMn1–O〉 | 〈2.1718〉 | 〈dNi1–O〉 | 〈2.0555〉 |
| BVS | b2.14[6] | BVS | b2.03[6] |
| S1–O1 | 1.4565(10) | S1–O1 | 1.4842(10) |
| S1–O2 | 1.4707(10) | S1–O2 | 1.4772(9) |
| S1–O3 | 1.4794(9) | S1–O3 | 1.4607(9) |
| S1–O4 | 1.4807(10) | S1–O4 | 1.4738(7) |
| 〈dS1–O〉 | 〈1.4718〉 | 〈dS1–O〉 | 〈1.4740〉 |
| BVS | b6.03[4] | BVS | b6.00[4] |
a
Average distances are given in 〈 〉 and coordination numbers are given in [ ].
b
Bond valence sum, B.V. = e(r0−r)/b with the following parameters: b = 0.37, r0 (NaI–O) = 1.803, r0 (SVI–O) = 1.624, r0 (NiII–O) = 1.654 and r0 (MnII–O) = 1.624.