The structural evolution and tunable photoluminescence of f-element bearing coordination polymers of the 2, 4, 6-tri-α-pyridyl-1, 3, 5-triazine ligand. Issue 34 (26th July 2019)

• Record Type: Journal Article
• Authors: Yue, Zenghui; Lu, Huangjie; Li, Zijian; Guo, Shangyao; Song, Junze; Ren, Yiming; Huang, Yu-Ying; Lin, Jian; Wang, Jian-Qiang
• Is Part Of: CrystEngComm. Volume 21:Issue 34(2019)
• Page Start: 5059
• Page End: 5066
• Publication Date: 2019-07-26
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c9ce00867e
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : An attempt at expanding the family of f-element bearing TPTZ coordination polymers has resulted in fifteen new complexes with topologies that evolved along the periodic table and tunable photoluminescence properties. Abstract : The exploration of the family of f-element bearing single-molecule coordination polymers via solvothermal reactions yielded fourteen new rare-earth single-molecule complexes with three distinct phases, Ln(TPTZ)(NO3 )3 CH3 CN (LnTPTZ-1, Ln = Pr and Nd), [Ln(TPTZ)(NO3 )3 (H2 O)]·CH3 CN (LnTPTZ-2, Ln = Pr–Er), and [Ln(TPTZ)(NO3 )3 (H2 O)]·2CH3 CN (LnTPTZ-3, Ln = Tm–Lu), as well as a uranyl coordination polymer UO2 (TPTZ)(NO3 )2 (UTPTZ ). All of the structures exhibited zero-dimensional topologies due to the self-assembly of f-element cations with 2, 4, 6-tri-α-pyridyl-1, 3, 5-triazine (TPTZ ), a tridentate semiaperture ligand featuring three ortho -N atoms on its pyridine and triazine rings. Due to the effect of lanthanide contraction, the structural evolution of the lanthanide complexes, including decrease in the unit cell dimensions and Ln–O/N bond lengths across the isomorphic structures, and more dramatically, transitions in the overall topology, was observed. In addition, a rather unusually bent Oyl UOyl unit with a highly distorted hexagonal bipyramid coordination environment was identified inUTPTZ . The homoleptic structures ofEuTPTZ-2 andTbTPTZ-2 allowed the fine-tuning of the molar ratio Eu/Tb in a singleEu x Tb 1− x TPTZ-2 complex, concomitantly giving rise to versatile photoluminescent colours in such materials. Explicitly, it exhibited multicolour photoluminescence ranging from green to red under the excitation of UV light, and an excellent linear relationship between chromacity coordinates and colour tunability could be obtained.