The　construction　of　molecular　crystal　materials　with　physical　properties　that　can　be　dynamically　controllable　through　various　stimuli　such　as　light　and　electricity　is　of　extraordinary　significance,　while　this　remains　a　tremendous　challenge.　In　this　context,　we　demonstrate　two　novel　2-D　multi-function　viologen　complexes,　{[Ln(bcbp)(BDC)(CH3OH)(H2O)2]·Cl·CH3OH·H2O}n　(1-Eu,　and　2-Dy;　H2bcbp·2Cl　=　1,1′-bis(4-carboxyphenyl)-(4,4′-bipyridinium)　dichloride;　BDC　=　p-phthalic　acid,　and　Ln　=　Eu,　Dy).　Due　to　the　strong　π-π　interaction　between　viologen　and　BDC　in　the　interlocked　structure,　both　compounds　exhibit　rapid　and　reversible　responses　under　the　stimuli　of　UV　light　and　electricity.　Furthermore,　accompanying　the　photochromic　process,　photo-modulated　luminescent　and　photomagnetic　behavior　have　been　observed.　Considering　the　excellent　photochromic　performance,　the　function　filter　paper　and　smart　organic　glass　were　successfully　prepared　and　used　for　ink-free　printing　and　UV　light　filtering.　©　2024