TY - JOUR
T1 - Trivalent Lanthanide Chalcogenolates
T2 - Ln(SePh)3, Ln2(EPh)6, Ln4(SPh)12, and [Ln(EPh)3]n (E = S, Se). How Metal, Chalcogen, and Solvent Influence Structure
AU - Lee, Jongseong
AU - Freedman, Deborah
AU - Melman, Jonathan H.
AU - Brewer, Meggan
AU - Sun, Lei
AU - Emge, T. J.
AU - Long, F. H.
AU - Brennan, John G.
PY - 1998/5/18
Y1 - 1998/5/18
N2 - A series of trivalent lanthanide (Ln) benzenechalcogenolate (EPh, E = S, Se) complexes have been prepared and structurally characterized in an attempt to evaluate how metal size, chalcogen, and solvent influence structure and physical properties. The compounds [(Py)3Ln(SPh)3]2 (Ln = Ho (1) and Tm (2)), [(py)2Sm(SPh)3]4 (3), [(THF)Sm(SPh)3]4n (4), (THF)3Ln(SePh)3 (Ln = Tm (5), Ho (6), Er (7)), [(py)3Sm(SePh)3]2 (8), and [(THF)4Ln3-(SePh)9]n (Ln = Pr (9), Nd (10), and Sm (11)) were isolated and characterized by IR, NMR, and UV-visible spectroscopy. Compounds 2-4, 7, 8, and 10 have also been characterized by low-temperature single-crystal X-ray diffraction. Three trends in structure are clear. First, the tendency to form oligomeric structures is found to increase with the size of the lanthanide ion. Second, thiolates bridge metal ions to form polynuclear structures more effectively than selenolates. Finally, pyridine displaces bridging chalcogenolates to form less extended structures more effectively than THF. Compounds 5-7 are molecular fac-octahedral complexes, compounds 1, 2, and 8 are bimetallic molecules with a pair of chalcogen atoms spanning the pentagonal bipyramidal metal centers, compound 3 is a tetrametallic structure with an alternating (3-2-3) number of μ2-thiolates spanning the linear assembly of four seven-coordinate Sm(III) ions, and compounds 4, 9, 10, and 11 are polymers with sets of three doubly bridging benzenechalcogenolates connecting adjacent metal ions. Resonance Raman spectroscopy indicates that the intense electronic absorption associated with Sm(III) chalcogenolate is a chalcogen-to-metal charge-transfer excitation. Compounds 1 and 2 decompose thermally to give Ln2S3.
AB - A series of trivalent lanthanide (Ln) benzenechalcogenolate (EPh, E = S, Se) complexes have been prepared and structurally characterized in an attempt to evaluate how metal size, chalcogen, and solvent influence structure and physical properties. The compounds [(Py)3Ln(SPh)3]2 (Ln = Ho (1) and Tm (2)), [(py)2Sm(SPh)3]4 (3), [(THF)Sm(SPh)3]4n (4), (THF)3Ln(SePh)3 (Ln = Tm (5), Ho (6), Er (7)), [(py)3Sm(SePh)3]2 (8), and [(THF)4Ln3-(SePh)9]n (Ln = Pr (9), Nd (10), and Sm (11)) were isolated and characterized by IR, NMR, and UV-visible spectroscopy. Compounds 2-4, 7, 8, and 10 have also been characterized by low-temperature single-crystal X-ray diffraction. Three trends in structure are clear. First, the tendency to form oligomeric structures is found to increase with the size of the lanthanide ion. Second, thiolates bridge metal ions to form polynuclear structures more effectively than selenolates. Finally, pyridine displaces bridging chalcogenolates to form less extended structures more effectively than THF. Compounds 5-7 are molecular fac-octahedral complexes, compounds 1, 2, and 8 are bimetallic molecules with a pair of chalcogen atoms spanning the pentagonal bipyramidal metal centers, compound 3 is a tetrametallic structure with an alternating (3-2-3) number of μ2-thiolates spanning the linear assembly of four seven-coordinate Sm(III) ions, and compounds 4, 9, 10, and 11 are polymers with sets of three doubly bridging benzenechalcogenolates connecting adjacent metal ions. Resonance Raman spectroscopy indicates that the intense electronic absorption associated with Sm(III) chalcogenolate is a chalcogen-to-metal charge-transfer excitation. Compounds 1 and 2 decompose thermally to give Ln2S3.
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U2 - 10.1021/ic9716161
DO - 10.1021/ic9716161
M3 - Article
AN - SCOPUS:0001076860
VL - 37
SP - 2512
EP - 2519
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 10
ER -