A　novel　stilbene-based　salicylhydrazone　compound　{systematic　name:　(E)-4,4＇-(ethene-1,2-diyl)bis[(N＇E)-N＇-(2-hydroxybenzylidene)benzohydrazide]　dimethyl　sulfoxide　disolvate,　C30H24N4O4　center　dot　2C(2)H(6)OS　or　L　center　dot　2DMSO}　was　synthesized　and　characterized　by　single-crystal　X-ray　diffraction,　powder　X-ray　diffraction　and　luminescence　spectroscopy.　The　title　compound　crystallizes　in　the　monoclinic　space　group　P2(1)/c,　with　half　a　symmetry-independent　L　molecule　and　one　dimethyl　sulfoxide　(DMSO)　solvent　molecule　in　the　asymmetric　unit.　The　L　molecule　adopts　an　almost　planar　structure,　with　a　small　dihedral　angle　between　the　planes　of　the　stilbene　and　salicylhydrazone　groups.　There　are　multiple　pi-pi　stacking　interactions　between　adjacent　L　molecules.　The　DMSO　solvent　molecules　act　as　proton　donors　and　acceptors,　forming　hydrogen　bonds　of　various　strengths　with　the　L　molecules.　In　addition,　the　geometry　optimization　of　a　single　molecule　of　L　and　its　luminescence　properties　either　in　solution,　as　a　solvated　solid　or　as　a　desolvated　solid　were　studied.　The　compound　shows　an　aggregation-induced　emission　(AIE)　effect　and　exhibits　switchable　luminescence　colouration　in　the　solid　state　by　the　simple　removal　or　re-addition　of　the　DMSO　solvent.