Tetra-coordinated organoboron complexes with triaminoguanidine-salicylidene based ligands: aggregation induced enhanced emission and mechanoresponsive features
Balamurugan Tharmalingam, Rajendran Kishore Kumar, Ottoor Anitha, Werner Kaminsky, J.G. Małecki, Balasubramanian Murugesapandian
Abstract
one-step condensation reaction with excess phenylboronic acid. Single-crystal X-ray diffraction analysis revealed that in the mononuclear complexes (6-8 & 10), boron atoms adopt tetrahedral geometry with fused five-membered N-B-N and six-membered O-B-N chelate ring whereas in the dinuclear complex (9), two boron atoms exist in distinct coordination environment, forming four fused boron-incorporated rings, including six-membered N-B-N, six-membered O-B-N, seven-membered N-B-O and five-membered N-B-N chelate rings. Our findings provide a unique family of mononuclear organoboron complexes and dinuclear organoboron complex with ESIPT unit. Aggregation induced enhanced emission features of the compounds were established in THF-water mixture and supported by DLS and SEM analyses. Interestingly, compound 6, 9 and 10 shows interesting mechanoresponsive features upon grinding.