It is observed that the SeO2∙∙∙H2O and SeO2∙∙∙C2H4O complexes, along with their S analogs, have Cs symmetry. Interestingly, the structure of the SeO2∙∙∙CH3OCH3 complex possesses C1 symmetry, whilst its S analog has Cs symmetry. The remaining complexes exhibit C1 ...