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Enhanced luminescence and tunable magnetic properties of lanthanide coordination polymers based on fluorine substitution and phenanthroline ligand

机译:基于氟取代和菲咯啉配体的镧系配位聚合物的增强的发光和可调磁性能

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A family of highly stable lanthanide coordination polymers incorporating fluorine-substituted carboxylate tectonics and the rigid ligand phenanthroline, namely, {[Ln _( m ) (Tfbda) _( n ) (Phen) _(2) ·2H _(2) O]·2H _(2) O} _( z ) , (Ln = Pr ( 1 ), Ho ( 4 ) and Gd ( 7 ), m = 2, n = 3); {[Ln _(3) (Tfbda) _( m _(1) ) (Tfba) _( m _(2) ) (Phen) _( n ) ·2H _(2) O]·H _(2) O} _( z ) ( z > 1, Ln = Dy ( 3 ), Er ( 5 ) and Yb ( 6 ), m _(1) = 4, m _(2) = 1, n = 3); [Ln _(2) (H _(2) Tfbda) _(4) (Phen) _(2) ·(H _(2) O) _(2) ]·Phen (Ln = Nd ( 2 )), Tfbda = 3,4,5,6-tetrafluoro-benzene-1,2-dioic acid, Tfba = 2,3,4,5-tetrafluorobenzoic acid have been afforded under hydrothermal conditions. The series of coordination polymers exhibited diverse structural motifs, from dinuclear cluster to 1-D chain arrary, displaying efficiently sensitized luminescence over a spectral range from visible to near-infrared (NIR) region and a long lifetime, due to efficient energy transfer from fluorine-substituted ligands to Ln( III ) centers in solid state. Slow relaxation magnetization and significant frequency- and temperature-dependent peaks were observed in trinuclear Dy( III )-based coordination polymer 3 . DC magnetic susceptibility studies reveal the existence of weak ferromagnetic interaction within 7 .
机译:一族高度稳定的镧系配位聚合物,结合了氟取代的羧酸盐构造和刚性配体菲咯啉,即{[Ln _(m)(T​​fbda)_(n)(Phen)_(2)·2H _(2)O ]·2H _(2)O} _(z),(Ln = Pr(1),Ho(4)和Gd(7),m = 2,n = 3); {[Ln _(3)(Tfbda)_(m _(1))(Tfba)_(m _(2))(Phen)_(n)·2H _(2)O]·H _(2) O} _(z)(z> 1,Ln = Dy(3),Er(5)和Yb(6),m_(1)= 4,m_(2)= 1,n = 3); [Ln _(2)(H _(2)Tfbda)_(4)(苯)_(2)·(H _(2)O)_(2)]·苯(Ln = Nd(2)),在水热条件下已经提供了Tfbda = 3,4,5,6-四氟苯-1,2-二酸,Tfba = 2,3,4,5-四氟苯甲酸。该系列配位聚合物表现出从双核簇到1-D链排列的多种结构基序,归因于从氟到氟的有效能量转移,在从可见光到近红外(NIR)区域的光谱范围内均显示出有效的敏化发光,并具有长寿命Ln(III)的取代的配体以固态为中心。在基于三核Dy(III)的配位聚合物3中观察到慢弛豫磁化强度以及明显的频率和温度相关峰。直流磁化率研究表明7内存在弱铁磁相互作用。

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