Table 3. Interaction pathway, degeneracy number of distances, N, mean bond distances, d/Å, and temperature coefficients, b/Å2, in the LAXS studies of the solvated strontium(ii) and barium(ii) ions in dmf and dma solutions at room temperature. The M–O–C angle, calculated from the given bond distances, is listed for each species.
| Species | Path | N | d | b |
| Strontium(ii) trifluoromethanesulfonate in dmf, 0.5845 mol dm–3 | ||||
| [Sr(OCHN(CH3)2)N]2+ | Sr–O | 6.8 | 2.513(6) | 0.0104(2) |
| Sr···C | 6.8 | 3.730(8) | 0.0156(10) | |
| ∠(Sr–O–C): 165(5)° | ||||
| Strontium(ii) trifluoromethanesulfonate in dma, 0.6457 mol dm–3 | ||||
| [Sr(OC(CH3)N(CH3)2)N]2+ | Sr–O | 6.7 | 2.506(4) | 0.0109(2) |
| Sr···C | 6.7 | 3.725(4) | 0.0134(4) | |
| ∠(Sr–O–C): 164(3)° | ||||
| Barium(ii) trifluoromethanesulfonate in dmf, 0.7339 mol dm–3 | ||||
| [Ba(OCHN(CH3)2)N]2+ | Ba–O | 7.8 | 2.736(4) | 0.0096(5) |
| Ba···C | 7.8 | 3.769(4) | 0.0175(5) | |
| ∠(Ba–O–C): 139.4(10)° | ||||
| Barium(ii) trifluoromethanesulfonate in dma, 0.7074 mol dm–3 | ||||
| [Ba(OC(CH3)N(CH3)2)N]2+ | Ba–O | 7.3 | 2.707(3) | 0.0145(3) |
| Ba···C | 7.3 | 3.787(7) | 0.0233(11) | |
| ∠(Ba–O–C): 143.7(12)° | ||||