Research Article
N-Heterocyclic Germylenes: Structural Characterisation of Some Heavy Analogues of the Ubiquitous N-Heterocyclic Carbenes
Table 2
Selected crystallographic parameters for compounds 1 to 4.
| | Compound | 1 | 2 | 3 | 4 |
| | Formula | C18 H20 Ge N2 | C20 H24 Ge N2 | C26 H36 Ge N2 | C18 H20 Sn N2 | | Formula weight | 336.95 | 365.00 | 449.16 | 383.05 | | Crystal system | Triclinic | Triclinic | Monoclinic | Monoclinic | | Space Group | P-1 | P-1 | Cc | P21/n | | λ Å | 0.71073 | 0.71073 | 0.71073 | 0.71073 | | a Å | 8.1814(8) | 8.1547(6) | 20.1744(19) | 16.8817(5) | | b Å | 10.4765(8) | 10.2887(8) | 6.4753(5) | 8.0981(4) | | c Å | 11.0444(11) | 12.5095(10) | 20.1943(15) | 18.3081(6) | | α° | 69.522(8) | 76.744(7) | 90 | 90 | | β° | 74.920(9) | 75.010(7) | 102.822(8) | 96.770(3) | | γ° | 67.374(8) | 66.828(7) | 90 | 90 | | Volume Å3 | 809.89(15) | 922.40(14) | 2572.3(4) | 2485.44(17) | | Temp. K | 123(2) | 123(2) | 193(2) | 123(2) | | Z | 2 | 2 | 4 | 6 | | 2 max° | 54.0 | 54.0 | 58.1 | 58.9 | | Reflns. Collected | 8394 | | 7323 | 12535 | | Reflns. Unique | 3433 | | 4561 | 6081 | | Rint | 0.0458 | | 0.0395 | 0.0357 | | Reflns. Obs. | 2663 | 7082 | 4041 | 4399 | | Goodness of Fit | 1.056 | 0.889 | 1.088 | 1.102 | | RI>2(I), F | 0.0451 | 0.0527 | 0.0473 | 0.0563 | | Rw, F2 | 0.0857 | 0.1272 | 0.1227 | 0.0914 |
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structure was found to be twinned and was refined against a hklf5 formatted reflection file. See deposited cif for further information. |
