Characterization of O-H⋯O interactions in linear and cyclic clusters of boric acid: An ab initio, DFT, QTAIM and NBO study

► Different cooperative effects in linear and cyclic BA clusters. ► A conspicuous contraction in HB length of cyclic (BA)6 relative to the dimer. ► Considerable electron localization in inner H···O bond critical points of cyclic (BA)6.