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This work provides the first full set of vibrational and rotational spectraldata needed to aid in the detection of AlH$_3$OH$_2$, SiH$_3$OH, andSiH$_3$NH$_2$ in astrophysical or simulated laboratory environments through theuse of quantum chemical computations at the CCSD(T)-F12b level of theoryemploying quartic force fields for the three molecules of interest. Previouswork has shown that SiH$_3$OH and SiH$_3$NH$_2$ contain some of the strongestbonds of the most abundant elements in space. AlH$_3$OH$_2$ also containshighly abundant atoms and represents an intermediate along the reaction pathwayfrom H$_2$O and AlH$_3$ to AlH$_2$OH. All three of these molecules are alsopolar with AlH$_3$OH$_2$ having the largest dipole of 4.58 D and the other twohaving dipole moments in the 1.10-1.30 D range, large enough to allow for thedetection of these molecules in space through rotational spectroscopy. Themolecules also have substantial infrared intensities with many of thefrequencies being over 90 km mol$^{-1}$ and falling within the currentlyuncertain 12-17 $\mu$m region of the spectrum. The most intense frequency forAlH$_3$OH$_2$ is $\nu_9$ which has an intensity of 412 km mol$^{-1}$ at 777.0cm$^{-1}$ (12.87 $\mu$m). SiH$-3$OH has an intensity of 183 km mol$^{-1}$ at1007.8 cm$^{-1}$ (9.92 $\mu$m) for $\nu_5$, and SiH$_3$NH$_2$ has an intensityof 215 km mol$^{-1}$ at 1000.0 cm$^{-1}$ (10.00 $\mu$m) for $\nu_7$.

Vibrational and Rotational Spectral Data for Possible Interstellar Detection of AlH$_3$OH$_2$, SiH$_3$OH, and SiH$_3$NH$_2$