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Yueqing Zheng, Lin-Xia Zhou, Jian-li Lin, Sun-Wei Zhang (2001)
Syntheses and Crystal Structures of Ln(phen)2(NO3)3 with Ln = Pr, Nd, Sm, Eu, Dy, and phen = 1,10‐phenanthrolineZeitschrift für anorganische und allgemeine Chemie, 627
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Structural Systematics of Rare Earth Complexes. IX. Tris(nitrato-O,O')(bidentate-N,N')lutetium(III), N,N'-Bidentate Equals 2,2'-Bipyridine or 1,10-PhenanthrolineAustralian Journal of Chemistry, 49
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Structures in solution and in the solid state of the complexes of lanthanum(III) with 1,10-phenanthroline. X-ray crystallographic and proton, carbon-13, oxygen-17 and lanthanum-139 solution NMR studiesInorganic Chemistry, 31
Changyan Sun, Lin-pei Jin (2004)
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Abstract Crystals of the compounds Yb(NO3)3(Phen)2 and La(NO3)3(Phen)2 (Phen = 1,10-phenanthroline) are investigated using X-ray diffraction. It is established that there exist two different crystalline modifications: the main modification (phase 1) is characteristic of all members of the isostructural series, and the second modification (phase 2) is observed only for the Eu, Er, and Yb elements. It is assumed that the stability and universality of main phase 1 are associated with the occurrence of the nonbonded π-π stacking interactions between the adjacent phenanthroline ligands in the complexes. The indication of the interactions is a distortion of the planar shape of the Phen molecule (the folding of the metallocycle along the N⋯N line with a folding angle of 11°–13° and its “boomerang” distortion). The assumption regarding the π-π stacking interaction is very consistent with the shape of the ellipsoids of atomic thermal vibrations, as well as with the data obtained from thermography and IR spectroscopy. An analysis of the structures of a number of rare-earth compounds has demonstrated that the intracomplex π-π stacking interactions directly contribute to the formation of supramolecular associates in the crystals, such as molecular dimers, supramolecules, chain and layered ensembles, and framework systems.
Crystallography Reports – Springer Journals
Published: Jan 1, 2009
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