A series of lanthanide compounds based on mixed aromatic carboxylate ligands: Syntheses, crystal structures and luminescent properties

A series of lanthanide complexes, [LnL1L21/2(H2O)2]n [Ln = La(1), Sm(2), Gd(3), Eu(4), H2L1 = 2,4-bis(4-methylbenzoyl)isophthalic acid and H2L2 = 2,5-bis(4-methylbenzoyl)terephthalic acid] have been prepared under hydrothermal conditions and characterized by PXRD, IR, elemental analysis and single crystal X-ray diffraction. Complexes 1–4 are isostructural and comprise paddlewheel dinuclear lanthanide secondary building units linked by four carboxylic groups. L1 ligands link the dinuclear lanthanide building blocks to form one-dimensional double-stranded looplike chains. The chains are further connected together to form two-dimensional layers by L2. Furthermore, the luminescent properties of 2 and 4 were also studied.

Graphical abstractFour isostructural lanthanide compounds constructed with two different substituted aromatic carboxylate ligands have been prepared hydrothermally. 2,4-Bis(4-methylbenzoyl)isophthalic acids link the paddlewheel dinuclear units into 1D double-stranded looplike chains. And the chains are further connected into 2D layers by 2,5-bis(4-methylbenzoyl)terephthalic acids. The luminescent properties of 2 and 4 were also studied.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A series of lanthanide coordination polymers have been synthesized. ► The lanthanide compounds are constructed by two substituted aromatic carboxylate ligands. ► The photoluminescent properties have been investigated.