Table 2. Spectroscopic data for Mo complexes of DPPh, DPAn and DPMEP ligands and their derivatives.
| Compound | v CO a (cm−1) | 31P{1H} NMR (ppm) | 13C{1H} NMR (ppm) of M–CO ligandsd |
|---|---|---|---|
| DPPh | — | −20.5 (s)b | — |
| DPAn | — | −22.3 (s)b | — |
| DPMEP | — | −22.4 (s)b | — |
| [Mo(CO)4(nbd)] | 2041, 1951, 1888 | — | — |
| [Mo(CO)4(DPPh)] | 2031, ∼1939, 1920 | 51.7 (s)b | 215.2 (m, COeq), 208.9 (t, 2JP,C = 8.5 Hz, COax)19 |
| [Mo(CO)4(DPAn)] | 2028, ∼1932, 1916 | 49.0 (s)b | 215.9–215.5 (m, COeq), 209.1 (t, 2JP,C = 8.6 Hz, COax) |
| [Mo(CO)4(DPMEP)] | 2028, ∼1932, 1915 | 48.9 (s)b | 215.8–215.4 (m, COeq), 209.0 (t, 2JP,C = 8.6 Hz, COax) |
| [MOE-NH3][Mo(CO)4(DPPh-NH-MOE)] | 2024, ∼1931, 1902 | 72.5 (d, J = 3.3 Hz), 70.2 (d, J = 3.3 Hz)c | 217.9 (m, COeq), 210.0 (t, 2JP,C = 8.6 Hz, COax)19 |
| [MOE-NH3][Mo(CO)4(DPAn-NH-MOE)] | 2023, ∼1928, 1899 | 69.3 (s), 67.4 (s)c | 218.0–217.5 (m, COeq), 209.7 (t, 2JP,C = 8.5 Hz, COax) |
| [MOE-NH3][Mo(CO)4(DPMEP-NH-MOE)] | 2021, 1927, 1897 | 69.1 (d, J = 2.7 Hz), 66.4 (d, J = 2.7 Hz)c | 218.3–217.8 (m, COeq), 209.8 (t, 2JP,C = 8.5 Hz, COax) |
a
CH2Cl2, 1 mg mL−1, “∼” denotes shoulder peak.
b
162 MHz, CDCl3.
c
162 MHz, CD2Cl2.
d
126 MHz CD2Cl2.