New evidence on non-covalent interactions in crystalline halo-substituted boron difluoride acetylacetonates from vibrational spectra, model calculations and visualization program tools

•Raman spectra of the F2B(AcAcX) with  X= = H, Cl, Br, I were measured.•DFT calculations of the dimer and tetramer models remarkably fit experiment.•Combined investigation of non-covalent interactions in crystalline was performed.•Vibrational coupling νBF2+δCαH is essential for the band assignment and correlations.