scholarly journals Thermal expansion and magnetic properties of benzoquinone-bridged dinuclear rare-earth complexes

2017 ◽  
Vol 46 (39) ◽  
pp. 13582-13589 ◽  
Author(s):  
Jani O. Moilanen ◽  
Akseli Mansikkamäki ◽  
Manu Lahtinen ◽  
Fu-Sheng Guo ◽  
Elina Kalenius ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Thermal Expansion ◽  
Rare Earth ◽  
Single Crystal ◽  
Powder Diffraction ◽  
Rare Earth Complexes ◽  
Metal Centers ◽  
X Ray

The complexes [BQ(MCl2·THF3)2] (M = Y or Dy) possessing pentagonal bipyramidal environment around metal centers undergo significant thermal expansion as revealed by single-crystal X-ray and powder diffraction experiments.

(thf)2Ln(Ge9{Si(SiMe3)3}3)2 (Ln = Eu, Sm): the first coordination of metalloid germanium clusters to lanthanides

2021 ◽  
Author(s):  
Andreas Schnepf ◽  
Svetlana Klementyeva ◽  
Claudio Schrenk ◽  
Marat M Khusniyarov ◽  
Minghui Zhang
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Crystallographic Analysis ◽  
Rare Earth Complexes ◽  
Group 14 ◽  
X Ray ◽  
Germanium Clusters

We report the synthesis, structure and magnetic properties of the first rare earth complexes of metalloid group 14 clusters [(thf)2Ln(Ge9Hyp3)2] (Ln = Eu, Sm, Hyp = Si(SiMe3)3). X-ray crystallographic analysis...

Structural Systematics of Rare Earth Complexes. XIV Hydrated 1 : 1 Adducts of Lanthanoid(III) Nitrates with 2,2′:6′,2″-Terpyridine

1999 ◽  
Vol 52 (6) ◽  
pp. 507 ◽  
Author(s):  
Lioubov I. Semenova ◽  
Allan H. White
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Room Temperature ◽  
Rare Earth Complexes ◽  
X Ray ◽  
C 23 ◽  
Structure Determinations

Room-temperature single-crystal X-ray structure determinations are recorded for (hydrated) lanthanoid(III) nitrate/2,2′:6′,2″-terpyridine (‘tpy’) (1 : 1) complexes; all are of the form Ln(NO3)3/tpy/H2O(1 : 1 :x), [(tpy)Ln(O2NO)2(OH2)y](NO3)(.z H2O), and form two series of compounds. For Ln = La(-)Gd, the complexes are [(tpy)Ln(O2NO)2(OH2)3](NO3), the lanthanoid atom being ten-coordinate; crystals are triclinic, P 1, a ≈ 11·8, b ≈ 11·3, c ≈ 8·9 Å, α ≈ 75, β 69, γ ≈ 89°, Z = 2 f.u., conventional R on |F| 0·045, 0·062 for No 4513, 2710 independent ‘observed’ (I > 3σ(I)) diffractometer reflections for Ln = La, Gd respectively. For Ln = Tb(-)Lu, a different form is found: monoclinic, P 21/c, a ≈ 8·8, b ≈ 11·5, c ≈ 23·8 Å, β ≈ 111°, Z = 4, R 0·055, 0·037, 0·056 for No 2427, 3079, 1857 for Ln = Tb, Lu, Y respectively, the form of the complex being [(tpy)Ln(O2NO)2(OH2)2](NO3).2H2O, with nine-coordinate lanthanoid. Crystallization of the Ln = La adduct from methanol yields an adduct of La(NO3)3/tpy/MeOH (1 : 1 : 2) [(tpy)La(O2NO)3(HOMe)2] stoichiometry with 11-coordinate lanthanum. Crystals are triclinic, P 1, a 12·361(2), b 12·244(3), c 7·753(2) Å, α 96·56(2), β 103·22(2), γ 91·16(2)°, Z = 2, R 0·037 for No 6597.

Structural Systematics of Rare Earth Complexes. XVI (‘Maximally’) Hydrated Rare Earth(III) Bromides

1999 ◽  
Vol 52 (6) ◽  
pp. 531 ◽  
Author(s):  
Lioubov I. Semenova ◽  
Peter C. Junk ◽  
Brian W. Skelton ◽  
Allan H. White
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Room Temperature ◽  
Rare Earth Complexes ◽  
X Ray ◽  
Structure Determinations ◽  
First Time

Room-temperature single-crystal X-ray structure determinations carried out on rare earth bromides crystallized from water at room temperature define three series of hydrates LnBr3.nH2O. For Ln = La, Ce, a heptahydrate phase (n = 7) is defined, triclinic P 1, a ≈ 8·6, b ≈ 9·4, c ≈ 8·3 Å, α ≈ 108, β ≈ 99, γ ≈ 72°, isomorphous with the array described for the ‘early’ (Ln = La-Pr) rare earth chlorides, being binuclear [(H2O)7Ln(-Br)2Ln(OH2)7] Br4, Z = 1 dimer; conventional R on |F| were 0·051, 0·042 for 2323, 3451 independent ‘observed’ (I > 3σ(I)) diffractometer reflections respectively. For Ln = Pr(-)Dy, a hexahydrate phase is defined, monoclinic P 2/n, a ≈ 10·0, b ≈ 6·8, c ≈ 8·2 Å, β ≈ 93·5°, Z = 2 f.u., isomorphous with the array defined for the heavier (Ln = Nd, Lu, Y) rare earth chlorides, being [(H2O)6LnBr2] Br, with R 0·029, 0·034 for No 1590, 1388 respectively. For Ln = Ho(-)Lu, Y, an octahydrate is defined for the first time, monoclinic P 21/n, a ≈ 8·1, b ≈ 16·0, c ≈ 10·1 Å, b ≈ 94·0°, Z = 4 f.u., a new array of the form [Ln(OH2)8] Br3 emerging, with R 0·061, 0·048, 0·042 for No 1191, 2402, 1674 respectively, the metal environment being square antiprismatic.

Structural Systematics of Rare Earth Complexes. XX (Maximally) Hydrated Rare Earth Sulfates and the Double Sulfates (NH4)Ln(SO4)2.4H2O (Ln = La, Tb)

1999 ◽  
Vol 52 (6) ◽  
pp. 601 ◽  
Author(s):  
Cameron J. Kepert ◽  
Peter C. Junk ◽  
Brian W. Skelton ◽  
Allan H. White
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Room Temperature ◽  
Rare Earth Complexes ◽  
Two Dimensional ◽  
Sulfate Ions ◽  
X Ray ◽  
Double Sulfate ◽  
Trivalent Rare Earth ◽  
Double Sulfates

Room-temperature single-crystal X-ray studies carried out on trivalent rare earth sulfate hydrates, Ln2(SO4)3.xH2O, crystallized at local ambience suggest the following arrays to be prevalent. For Ln = La, the nonahydrate is found, hexagonal P 63/m, with conventional R on |F| 0·023 for No 1159 ‘observed’ (I >3σ(I)) diffractometer reflections (redetermination). Although for Ln = Ce a similar structure has been previously recorded, we have obtained that adduct as the monoclinic C 2/c, Z = 4, octahydrate, a phase also found for Ln = Lu and diverse representative intermediate lanthanoids: a ≈ 13·6, b ≈ 6·6, c ≈ 18·2 Å, β ≈ 102°; for Ln = Ce (redetermination), Dy, Yb (redetermination), Lu, R was 0·022, 0·035, 0·031, 0·024 for No 3279, 2127, 3008, 3325 respectively. The structures of two lower hydrates adventitiously obtained are also recorded: the pentahydrate for Ln = Ce, monoclinic C 2/c, a 15·741(3), b 9·632(3), c 10·358(3) Å, β 119·72(2)°, Z = 4, R 0·030 for No 3372 (a redetermination), and the trihydrate for Ln = Lu, orthorhombic Cmc21, a 13·527(5), b 18·415(5), c 9·242(7) Å, Z = 8, R 0·040 for No 1743. All structures are infinite polymeric arrays, the lanthanoid atoms being bridged by sulfate ions. Studies are also recorded for the ammonium/trivalent rare earth double sulfate tetrahydrate salts, (NH4)Ln(SO4)2.4H2O, for the (hitherto) extremal members Ln = La, Tb, which are isomorphous with the previously studied Ln = Sm monoclinic P 21/c, Z = 4 array, a ≈ 6·6, b ≈ 19, c ≈ 8·8 Å, β 97°; R 0·035, 0·037 for No 3631, 3337. The array is a two-dimensional polymer, parallel to the ac plane.

Structural Systematics of Rare Earth Complexes. VI. The Higher Hydrates of the Rare Earth Trichlorides

1994 ◽  
Vol 47 (2) ◽  
pp. 385 ◽  
Author(s):  
CJ Kepert ◽  
BW Skelton ◽  
AH White
Keyword(s):  
Hydrogen Bonding ◽  
Rare Earth ◽  
Single Crystal ◽  
Room Temperature ◽  
Rare Earth Complexes ◽  
X Ray ◽  
Structure Determinations ◽  
The Rare Earth

Single-crystal room-temperature X-ray structure determinations of improved precision are reported for certain higher hydrates of the rare earth trichlorides (LnCl3.7H2O, Ln = La, Pr; LnCl3.6H2O, Ln = Nd, Lu) (triclinic, Pī, and monoclinic, P 2/n, forms respectively) in order to define hydrogen-bonding arrays within the two lattices.

scholarly journals Magnetization, crystal structure and anisotropic thermal expansion of single-crystal SrEr2O4

RSC Advances ◽  
2014 ◽  
Vol 4 (96) ◽  
pp. 53602-53607 ◽  
Author(s):  
Hai-Feng Li ◽  
Andrew Wildes ◽  
Binyang Hou ◽  
Cong Zhang ◽  
Berthold Schmitz ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
High Resolution ◽  
Single Crystal ◽  
Powder Diffraction ◽  
X Ray ◽  
Anisotropic Thermal Expansion

The magnetization, crystal structure, and thermal expansion of a nearly stoichiometric Sr1.04(3)Er2.09(6)O4.00(1)single crystal have been studied by PPMS measurements and in-house and high-resolution synchrotron X-ray powder diffraction.

Structural Systematics of Rare Earth Complexes. XVII Hydrated 1 : 1 Adducts of 2,2′:6′,2″-Terpyridine with the Lanthanoid(III) Bromides and Some Binuclear Hydroxy-Bridged Dimers

1999 ◽  
Vol 52 (6) ◽  
pp. 539 ◽  
Author(s):  
Lioubov I. Semenova ◽  
Allan H. White
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Coordination Sphere ◽  
Room Temperature ◽  
Rare Earth Complexes ◽  
Water Molecules ◽  
X Ray ◽  
Cell Determination ◽  
Outer Water ◽  
Structural Characterizations

Room-temperature single-crystal X-ray structural characterizations are recorded for hydrated lan- thanoid(III) bromide/2,2′:6′,2″-terpyridine (tpy) (1 : 1) complexes, showing all to be ionic and of the form [(tpy)Ln(OH2)x]Br3.yH2O, where x and y are 6 and 1 for the isomorphous series Ln = La(-)Er (and intermediate members, by presumption), and 5 and various values for Ln = Tm, Yb, Lu. Crystals of [(tpy)Ln(OH2)6]Br3.H2O are monoclinic, P 21/c, a ≈ 8·5, b ≈ 18, c ≈ 16·3 Å, β ≈ 108°, Z = 4; for Ln = La, Er, conventional R values on |F| were 0·048, 0·080 for No 4027, 1347 ‘observed’ (I > 3σ(I)) diffractometer reflections respectively. The complex [(tpy)Tm(OH2)5]Br3.H2O is monoclinic, P 21/c, a 8·506(4), b 17·376(1), c 15·951(6) Å, β 106·87(3)°, Z = 4, (quasi-)isomorphous with the Ln = La-Er array, R 0·065 for No 2067. [(tpy)Yb(OH2)5]Br3.4H2O is triclinic, P 1, a 11·902(2), b 11·639(3), c 9·831(2) Å, α 98·92(2), β 106·84(2), γ 92·42(2)°, Z = 2, R 0·062 for No 3422, while [(tpy)Lu(OH2)5]Br3.H2O is monoclinic, P 21/n, a 13·635(8), b 9·022(5), c 19·03(1) Å, β 99·02(5)°, Z = 4, R 0·043 for No 3139. Despite a common N3LnO5 coordination sphere in the last three compounds, subtle differences are found in stereochemistry; in the N3LnO6 array, one of the outer water molecules becomes progressively detached as the lanthanoid radius contracts. Some tendency is found toward the end of the lanthanoid series toward the formation of di(hydroxy-bridged) neutral dimers, Ln(OH)Br2/tpy/H2O(1 : 1 : 8)(×2), [(tpy)(H2O)3Ln(µ-OH)2Ln(OH2)3(tpy)]Br4.10H2O, monoclinic, C 2/c, a ≈ 19·5, b ≈ 14·5, c ≈ 17·1 Å, β ≈ 92°, Z = 4 dimers, thus far defined by full determinations for the extrema Lu = Er, Lu (and Y), R 0·055, 0·043, (0·047) for No 3141, 4591, (2991) respectively; the dimer is disposed about a crystallographic 2 -axis. An Ln = Dy example, seemingly isomorphous, has also been characterized by cell determination.

Cd4 Tetrahedra and Condensed RE6Rh Trigonal Prisms as Building Units in the Rare Earth-rich Compounds RE15Rh5Cd2 (RE = La, Ce, Pr, Nd)

2011 ◽  
Vol 66 (6) ◽  
pp. 559-564 ◽  
Author(s):  
Frank Tappe ◽  
Ute Ch. Rodewald ◽  
Rolf-Dieter Hoffmann ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Powder Diffraction ◽  
Three Dimensional ◽  
Induction Melting ◽  
X Ray ◽  
Dimensional Network ◽  
New Type ◽  
The Rare Earth ◽  
Trigonal Prisms

The rare earth-rich compounds RE15Rh5Cd2 (RE = La, Ce, Pr, Nd) were synthesized by induction melting of the elements in sealed tantalum tubes and characterized by X-ray powder diffraction. The structure of La15Rh5Cd2 was refined from single-crystal diffractometer data: new type, R3m, a = 1016.4(2), c = 4418.7(9) pm, wR2 = 0.0417, 2258 F2, 95 variables. Striking structural motifs in the RE15Rh5Cd2 intermetallics are rhodium-centered trigonal prisms RE6Rh which are condensed via common corners and edges to a complex three-dimensional network which leaves cavities for Cd4 tetrahedra and RE6 octahedra. The structural relationship with the recently discovered structure types Gd4RhIn and Pr23Ir7Mg4 is discussed.

Synthesis and Fluorescence Property of Rare-Earth Terbium Active Monomer Complexes

2013 ◽  
Vol 328 ◽  
pp. 724-728 ◽  
Author(s):  
Dong Mei Wang ◽  
Wen Bo Cao ◽  
Jian Fan
Keyword(s):  
Rare Earth ◽  
Powder Diffraction ◽  
Polymer Matrix ◽  
Elemental Analysis ◽  
Rare Earth Ions ◽  
Rare Earth Complexes ◽  
Structure And Properties ◽  
Combinatorial Method ◽  
X Ray ◽  
Ft Ir

Tb-MA-Phen mononuclear rare earth complexes were prepared. The structure and properties of the complexes were characterized by elemental analysis, FT-IR and UV, TA, X-ray powder diffraction and SEM. Moreover, the rare earth ions were doped into the polymer matrix using the combinatorial method. High luminescence copolymer was synthesized by polymerizing α-methyl methyacrylate (MA) and Styrene (St) with terbium-methacrylate complex in solution with AIBN as initiator, respectively.

Structural Systematics of Rare Earth Complexes. XV Tris(2,2′:6′,2″-terpyridine)lanthanoid(III) Tris(perchlorate) Complexes

1999 ◽  
Vol 52 (6) ◽  
pp. 519 ◽  
Author(s):  
Lioubov I. Semenova ◽  
Alexander N. Sobolev ◽  
Brian W. Skelton ◽  
Allan H. White
Keyword(s):  
Rare Earth ◽  
Single Crystal ◽  
Coordination Number ◽  
Room Temperature ◽  
Structural Type ◽  
Rare Earth Complexes ◽  
X Ray ◽  
Structure Determinations

Room-temperature single-crystal X-ray structure determinations of the 1 : 3 adducts of the trivalent lanthanoid perchlorates with 2,2′:6′,2″-terpyridine (‘tpy’) as crystallized from acetonitrile are recorded. The Ln = La complex is the only one of its structural type, being modelled as La(ClO4)3/tpy/MeCN/H2O (1 : 3 : 2 :2/3), trigonal P 3c1, Z = 6, a 13·063(7), c 53·04(4) Å, recorded on an interim basis, with conventional R on |F| 0·081 for No 2889 ‘observed’ (I >3σ(I)) reflections. For Ln = Ce, (Pr, Sm,) Eu and, by presumption, other intermediate members, a monosolvate is found, monoclinic P 21/n, a ≈ 9·3, b ≈ 21·1, c ≈ 24·7 Å, β ≈ 91°, Z = 4, R being 0·045, (0·060, 0·049,) 0·047 for No 4420, (4199, 3931,) 3713. The Ln = Eu adduct has also been obtained unsolvated in a form representative of Ln = Eu, Lu and, by presumption, intermediate members, as well as Y, which is monoclinic C 2/c, Z = 4, R being 0·051, 0·044, 0·061 for No 4386, 4407, 3713. All monoclinic systems are of the form [Ln(tpy)3] (ClO4)3(.S), Ln being nine-coordinate, and in the case of the C 2/c phase lying on a crystallographic 2 axis. The Ln = La adduct was modelled with three independent cations, all with crystallographic 3 symmetry, two with their coordination number augmented by the approach of solvent along the 3 axis.

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