Table 1.
Nuclear Magnetic Resonance (NMR) parameters associated with the different proton (1H) species detected in the various samples (bone mineral, CHA-SBF and Monetite): 1H chemical shifts (δ1H); dipolar coupling constants for the 31P-1H interaction (DPH); P•••H internuclear distances (dPH); cross-polarization (CP) rate constants (THP); spin-diffusion rate constants (Tdf); spin-lattice relaxation times in the rotating frame (T1ρ1H). awas calculated according to Equation 3; whereas bwas calculated according to Equation 1.
| Sample | 1H species | δ(1H) (ppm) | DPH (Hz) | dPH (Å) | THPa (µs) | Tdf b (µs) | T1ρ (1H) (µs). |
|---|---|---|---|---|---|---|---|
| Bone mineral | OH− | 0.0 | — | — | 795 | — | ∞ |
| H2O | 5.2 | — | — | 522 | — | ∞ | |
| HPO42− | 9.8 | 4050 ± 500 | 2.24 ± 0.07 | — | 788 | 1485 | |
| HPO42− | 14.0 | 4695 ± 500 | 2.14 ± 0.07 | — | 624 | 1224 | |
| CHA-SBF | HPO42− | 7.0–17.0 | 4960 ± 500 | 2.10 ± 0.07 | — | 665 | 3531 |
| Monetite | HPO42− | 13.0 | 5275 ± 500 | 2.10 ± 0.07 | — | 626 | ∞ |
| HPO42− | 15.8 | 6863 ± 900 | 1.92 ± 0.14 | — | 691 | ∞ |