AI Article Synopsis
- New lanthanide cyanoborates were created using lanthanide chlorides and H[BH(CN)4] in acetonitrile or pyridine, leading to different structures depending on the solvent used.
- In acetonitrile, three-dimensional metal-organic frameworks (MOFs) form, while pyridine reactions yield one-dimensional coordination polymers, both featuring complex cations for charge balance.
- The resulting compounds exhibit strong photoluminescence, with Ce showing blue emissions and Eu/Tb displaying their characteristic colors, highlighting the effectiveness of the borate anions as building blocks in coordination chemistry.
Article Abstract
New lanthanide cyanoborates were synthesized from anhydrous lanthanide chlorides and the acid H[BH (CN) ] in either acetonitrile or pyridine. Reactions in acetonitrile lead to three-dimensional, anionic metal-organic frameworks (MOFs) [Ln {BH (CN) } ]⋅[Ln(CH CN) ] (Ln=Ce, Eu, Tb) which incorporate complex cations [Ln(CH CN) ] in the pores of the framework for charge compensation. In contrast, the reactions in pyridine result in the formation of one-dimensional coordination polymers [H(py) ][LnCl {BH (CN) } (py) ]⋅0.5 py (Ln=Ce, Pr, py=pyridine) with [H(py) ] as counter ions for the anionic strand structure. The products show intense photoluminescence, for Ce based on 5d-4f transitions in the blue spectral region, whereas the Eu and Tb compounds exhibit characteristic photoluminescence based on 4f-4f transitions of the respective lanthanide ions. The observed photoluminescence is mainly attributed to a direct excitation of the lanthanide ions and sensitization of the lanthanide ions by the [BH (CN) ] anions. These results mark the utilized borate anions as versatile building block for new coordination compounds.
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