Imidazo-pyrimidine derivatives are promising biologically relevant fluorophores due to their structural similarity with nucleic acids and pronounced photophysical response in biologically relevant microenvironments. These imidazo-pyrimidine derivatives present well-defined photophysical characteristics exhibiting fluorescence. In this work, we present a unified spectroscopic and computational investigation to elucidate the structure–function relationship and interaction dynamics of novel bio-imperative imidazo-pyrimidine derivatives with serum proteins and biomimicking micellar systems. Steady-state spectroscopic studies demonstrate strong binding interactions between one such derivative (SB1) and serum proteins, with a markedly higher affinity toward human serum albumin (HSA) compared to bovine serum albumin (BSA). These findings are corroborated by quenching and denaturation experiments as well as molecular docking analyses, which reveal preferential localization of the probe within a more hydrophobic binding pocket of HSA stabilized by π–π and alkyl interactions. This study extends the investigation to self-assembled systems, with another imidazo-pyrimidine derivative (BFIP), examining probe–micelle interactions in cationic CTAB and anionic SDS micelles using UV–visible spectroscopy, fluorescence measurements, dynamic light scattering, and molecular dynamics simulations. The surface charge of the micelles plays a decisive role in governing the interaction mechanism, with the probe forming a stable, hydrophobically driven complex within the CTAB micellar core, while remaining largely solvent-exposed and weakly associated in the pre-micellar regions of SDS. Density functional theory calculations encompassing FMO analysis, ESP mapping, and polarity statements further validate the structure–activity relationship of the probe and their propensity to interact with biomimicking systems. Collectively, this multiscale study provides comprehensive insights into how microenvironmental polarity, charge, and hydrophobicity modulate the binding and photophysical behaviour of imidazo-pyrimidine derivatives in diverse biomimetic systems, highlighting their potential as sensitive molecular probes for such systems, paving their applications in biomedical and pharmaceutical domains. This mainly highlights the novelty statement of the work.