Coordination complexes based on pentacyclohexanocucurbit[5]uril and lanthanide(iii) ions: lanthanide contraction effect induced structural variation

CrystEngComm ◽  
2012 ◽  
Vol 14 (20) ◽  
pp. 6983 ◽  
Author(s):  
Jing-Xin Liu ◽  
Ying-Feng Hu ◽  
Rui-Lian Lin ◽  
Wen-Qi Sun ◽  
Xiang-Feng Chu ◽  
...  
Keyword(s):  
Structural Variation ◽  
Coordination Complexes ◽  
Lanthanide Contraction ◽  
Contraction Effect

Coordination complexes based on V-shaped ligand and rare earth(III) ions: lanthanide contraction effect induced structural changes

2015 ◽  
Vol 68 (11) ◽  
pp. 1980-1996 ◽  
Author(s):  
Qian Cheng ◽  
Wei-Yan Huang ◽  
Qiu-Hong Huang ◽  
Yan-Ju Xiong ◽  
Jie-Fang Fang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Structural Changes ◽  
Coordination Complexes ◽  
Lanthanide Contraction ◽  
Contraction Effect

Macrocycle-based metal ion complexation: a study of the lanthanide contraction effect towards hexacyclohexanocucurbit[6]uil

CrystEngComm ◽  
2013 ◽  
Vol 15 (4) ◽  
pp. 738-744 ◽  
Author(s):  
Xiao Qin ◽  
Xin-Long Ni ◽  
Jing-Xu Hu ◽  
Kai Chen ◽  
Yun-Qian Zhang ◽  
...  
Keyword(s):  
Metal Ion ◽  
Metal Ion Complexation ◽  
Lanthanide Contraction ◽  
Ion Complexation ◽  
Contraction Effect

scholarly journals A series of lanthanide glutarates: lanthanide contraction effect on crystal frameworks of lanthanide glutarates

RSC Advances ◽  
2017 ◽  
Vol 7 (29) ◽  
pp. 17934-17940 ◽  
Author(s):  
Xiao-Feng Tan ◽  
Jian Zhou ◽  
Hua-Hong Zou ◽  
Lianshe Fu ◽  
Qiuling Tang ◽  
...  
Keyword(s):  
Structural Type ◽  
Lanthanide Contraction ◽  
Contraction Effect

Although some 3-D lanthanide glutarates have been reported, they exhibit a very robust structural type, whose structure is not changed by different Ln3+ ions, but compound 3 shows a new structural type.

The lanthanide contraction effect and organic additives impact the coordination structures of lanthanide ions with symmetrical octamethyl-substituted cucurbit[6]uril ligands

CrystEngComm ◽  
2019 ◽  
Vol 21 (37) ◽  
pp. 5641-5649 ◽  
Author(s):  
Rui-Lian Lin ◽  
Jia-Jia Zhou ◽  
Fu Hou Zhou ◽  
Wen-Qi Sun ◽  
Jing-Xin Liu ◽  
...  
Keyword(s):  
Lanthanide Ions ◽  
Organic Additives ◽  
Lanthanide Contraction ◽  
Contraction Effect

Two facts, the lanthanide contraction effect and the “bridge” role of organic additives, impact the coordination structures of lanthanide ions with OMeQ[6] ligands.

scholarly journals Chiral Lanthanide Complexes with l- and d-Alanine: An X-ray and Vibrational Circular Dichroism Study

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2729
Author(s):  
Krzysztof Lyczko ◽  
Joanna E. Rode ◽  
Jan Cz. Dobrowolski
Keyword(s):  
Circular Dichroism ◽  
Ir Spectra ◽  
Lanthanide Complexes ◽  
Vibrational Circular Dichroism ◽  
Mirror Reflection ◽  
Electron Configuration ◽  
X Ray ◽  
Lanthanide Contraction ◽  
Contraction Effect ◽  
Circular Dichroïsm

A whole series of [Ln(H2O)4(Ala)2]26+ dimeric cationic lanthanide complexes with both l- and d-alanine enantiomers was synthesized. The single-crystal X-ray diffraction at 100 and 292 K shows the formation of two types of dimers (I and II) in crystals. Between the dimer centers, the alanine molecules behave as bridging (μ2-O,O’-) and chelating bridging (μ2-O,O,O’-) ligands. The first type of bridge is present in dimers I, while both bridge forms can be observed in dimers II. The IR and vibrational circular dichroism (VCD) spectra of all l- and d-alanine complexes were registered in the 1750–1250 cm−1 range as KBr pellets. Despite all the studied complexes are exhibiting similar crystal structures, the spectra reveal correlations or trends with the Ln–O1 distances which exemplify the lanthanide contraction effect in the IR spectra. This is especially true for the positions and intensities of some IR bands. Unexpectedly, the ν(C=O) VCD bands are quite intense and their composed shapes reveal the inequivalence of the C=O vibrators in the unit cell which vary with the lanthanide. Unlike in the IR spectra, the ν(C=O) VCD band positions are only weakly correlated with the change of Ln and the VCD intensities at most show some trends. Nevertheless, this is the first observation of the lanthanide contraction effect in the VCD spectra. Generally, for the heavier lanthanides (Ln: Dy–Lu), the VCD band maxima are very close to each other and the mirror reflection of the band of two enantiomers is usually better than that of the lighter Lns. DFT calculations show that the higher the multiplicity the higher the stability of the system. Actually, the molecular geometry in crystals (at 100 K) is well predicted based on the highest-spin structures. Also, the simulated IR and VCD spectra strongly depend on the Ln electron configuration but the best overall agreement was reached for the Lu complex, which is the only system with a fully filled f-shell.

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