scholarly journals Synthesis, crystal structures and spectroscopic properties of pure YSb2O4Br and YSb2O4Cl as well as Eu3+- and Tb3+-doped samples

RSC Advances ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 640-647
Author(s):  
Ralf J. C. Locke ◽  
Felix C. Goerigk ◽  
Martin J. Schäfer ◽  
Henning A. Höppe ◽  
Thomas Schleid
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Properties ◽  
Green Luminescence ◽  
New Compounds ◽  
Oxygen Atoms

The oxygen atoms of the two new compounds belong to ψ1-tetrahedral [SbO3]3− units, which are either vertex-connected to four-membered rings in YSb2O4Cl or to endless chains in YSb2O4Br. Eu3+- and Tb3+-doped samples show red or green luminescence.

Synthesis, Crystal Structures, and Thermal and Spectroscopic Properties of Thiocyanato Coordination Compounds with 3-Acetylpyridine as a Ligand

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1419-1428
Author(s):  
Julia Werner ◽  
Inke Jeß ◽  
Christian Näther
Keyword(s):  
Transition Metal ◽  
Crystal Structures ◽  
Coordination Polymers ◽  
Coordination Compounds ◽  
Spectroscopic Properties ◽  
Second Step ◽  
Crystalline Phases ◽  
Thermogravimetric Investigations ◽  
New Compounds ◽  
Ir Spectroscopic

Abstract The reaction of transition metal thiocyanates with 3-acetylpyridine (3-Acpy) leads to the formation of compounds of compositions M(NCS)2(3-Acpy)4 (M1; M = Mn, Fe, Ni) and M(NCS)2(3- Acpy)2(H2O)2 (M2; M = Mn, Fe, Ni). Thermogravimetric investigations show that in the first step some of these compounds transform into the new coordination polymers M(NCS)2(3-Acpy)2 (M3 with M = Mn, Fe and Ni), that decompose into the new compounds M(NCS)2(3-Acpy) (M4 with M = Mn and Ni) in the second step. Unfortunately, the powder patterns of compounds M3 and M4 cannot be indexed, and there are strong indications that these compounds are contaminated with a small amount of the precursor or unknown crystalline phases. IR spectroscopic investigations indicate that in compounds M3 the metal cations are linked by μ-1,3-bridging thiocyanato anions into 1D or 2D coordination polymers that are further linked by the 3-Acpy ligands in compounds M4.

scholarly journals Spectral Analysis and Crystal Structures of 4-(4-Methylphenyl)-6-Phenyl-2,3,3a, 4-Tetrahydro-1H-Pyrido[3,2,1-jk]Carbazole and 4-(4-Methoxyphenyl)-6-Phenyl-2,3,3a, 4-Tetrahydro-1H-Pyrido[3,2,1-jk]Carbazole

2011 ◽  
Vol 2011 ◽  
pp. 1-7
Author(s):  
J. Kalyana Sundar ◽  
S. Natarajan ◽  
S. Chitra ◽  
Nidhin Paul ◽  
P. Manisankar ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Spectroscopic Properties ◽  
Boat Conformation ◽  
X Ray Diffraction ◽  
Monoclinic System ◽  
Space Group ◽  
X Ray ◽  
Triclinic System ◽  
New Compounds ◽  
Twist Boat

The crystal structures of 4-(4-methylphenyl)-6-phenyl-2,3,3a,4-tetrahydro-1H-pyrido[3,2,1-jk]carbazole (IIa) and 4-(4-methoxyphenyl)-6-phenyl-2,3,3a,4-tetrahydro-1H-pyrido[3,2,1-jk]carbazole (IIb) were elucidated by single crystal X-ray diffraction. Compound (IIa), C28H25N, crystallizes in the triclinic system, space group P-1, with a=8.936(2) Å,b=10.490(1) Å,c=11.801(1) Å,α=102.69(5)°, β=103.27(3)°,γ=93.80(1)°, and Z=2. The compound (IIb), C28H25NO, crystallizes in the monoclinic system, space group P21/a, with a=11.376(5) Å,b=14.139(3) Å,c=13.237(4) Å,β=97.41(3)°, and Z=4. In both the structures, the pyrido ring adopts a twist boat conformation and the carbazole molecule has the twisted envelope structure with C3 and C13 at the flap. No classical hydrogen bonds are observed in the crystal structures. Details of the preparation, structures, and spectroscopic properties of the new compounds are discussed.

Crystal Structures of New Pyrovanadates A2MnV2O7 (A = Rb, K)

2007 ◽  
Vol 62 (7) ◽  
pp. 873-880 ◽  
Author(s):  
Hamdi Ben Yahia ◽  
Etienne Gaudin ◽  
Jacques Darriet
Keyword(s):  
Crystal Structures ◽  
Unit Cell ◽  
Type Structure ◽  
Mirror Plane ◽  
Unit Cell Parameters ◽  
Alkali Cations ◽  
Space Group ◽  
Cell Parameters ◽  
New Compounds ◽  
Oxygen Atoms

Abstract The new compounds A2MnV2O7 (A = K, Rb) with structures related to the melilite-type have been synthesized by a solid state reaction route. The crystal structures of K2MnV2O7, Rb2MnV2O7 and KRbMnV2O7 have been determined using X-ray single crystal diffraction data. The compound K2MnV2O7 crystallizes with a melilite-type structure with tetragonal unit cell parameters a = 8.609(3), c = 5.538(4) Å and space group P4̅21m. The structures of Rb2MnV2O7 and KRbMnV2O7 are derived from the melilite-type structure with space group P4̅2/mnm and unit cell parameters a = 8.577(6), c = 11.809(6) Å , and a = 8.530(6), c = 11.466(5) Å , respectively. The three structures consist of [MnV2O7]2− layers perpendicular to the c axis separated by A+ layers. The [MnV2O7]2− layers feature corner-sharing MnO4 tetrahedra and V2O7 pyrovanadate units, the linkage leading to rings of five tetrahedra. The doubling of the c parameter for Rb2MnV2O7 or RbKMnV2O7 is explained by the existence of a mirror plane perpendicular to the [001] direction between two [MnV2O7]2− layers. The A+ alkali cations occupy distorted square antiprisms of oxygen atoms in K2MnV2O7 and distorted square prisms of oxygen atoms in Rb2MnV2O7and RbKMnV2O7.

The Gold Sulfates MAu(S04)2 (M = Na, K, Rb)

2001 ◽  
Vol 56 (12) ◽  
pp. 1340-1343 ◽  
Author(s):  
Mathias S. Wickleder ◽  
Oliver Büchner
Keyword(s):  
Sulfuric Acid ◽  
Single Crystals ◽  
Crystal Structures ◽  
Structural Features ◽  
Monovalent Cations ◽  
Coordination Numbers ◽  
Square Planar ◽  
Oxygen Atoms

AbstractThe evaporation of a solution of Au(OH)3 and Na2So4 in conc. sulfuric acid led to yellow single crystals of NaAu(SO4)2 (monoclinic, P21/n, Z = 2, a = 469.1, b = 845.9, c = 831.2 pm, β = 95.7°). Analogous procedures with K2SO4 or Rb2SO4 instead of Na2SO4 yielded single crystals of KAu(SO4)2 (monoclinic, C2/c, Z = 4, a = 1109.8, b = 724.2, c = 941.1 pm, β = 118.4°) and RbAu(S04)2, respectively, (triclinic, P1̄, Z = 1, a = 423.6, b = 497.5, c = 889.0 pm, a = 76.4°, β = 88.4°, γ = 73.5°). Although the crystal structures of the three sulfates are not isotypic they show similar structural features: The gold atoms are coordinated by four oxygen atoms in a square planar manner. These oxygen atoms belong to four SO42- ions which link the [AUO4] units to infinite chains according to 1∞[Au(SO4)4/ 2]- . These chains are connected via the monovalent cations which show coordination numbers of 6 (Na+), 10 (K+) and 12 (Rb+), respectively.

Five-coordinate copper(II) complexes: crystal structures, spectroscopic properties and new extended structural pathways of [Cu(chelate)2 X]Y, where chelate = dpyam, phen and bipy; X = pseudohalide ligands

2008 ◽  
Vol 64 (3) ◽  
pp. 318-329 ◽  
Author(s):  
Sujittra Youngme ◽  
Pongthipun Phuengphai ◽  
Chaveng Pakawatchai ◽  
Palangpon Kongsaeree ◽  
Narongsak Chaichit
Keyword(s):  
Crystal Structure ◽  
Size Effect ◽  
Crystal Structures ◽  
Direct Observation ◽  
Spectroscopic Properties ◽  
Modes Of Vibration

The crystal structures of four distortion isomers of the [Cu(chelate)2 X]+ cation, where chelate = 2,2-bipyridine (bipy), 1,10-phenanthroline (phen) and di-2-pyridylamine (dpyam), X = a pseudohalide ligand (NCO, NCS, N3 and C2N3), have been compared by scatterplot analysis with 25 [Cu(chelate)2 X]Y complexes of known crystal structure. The four new complexes [Cu(phen)2NCO]Br (1), [Cu(phen)2N3]BPh4·H2O (2), [Cu(dpyam)2(N3)]NO3·H2O (3) and [Cu(dpyam)2(N3)]ClO4 (4) involve a near regular square-based pyramidal stereochemistry (RSBP). The structures of complexes (1) and (2) are of the rare cases found for the phen analogue. Scatterplots of the 29 cation distortion isomers of the [Cu(chelate)2 X]Y series of complexes suggest that most of the 29 complexes lie on a common structural pathway, involving a mixture of the symmetric, C 2, and the asymmetric, non-C 2, in-plane modes of vibration of the CuN4N′ chromophore. Some datapoints are found to lie on extended routes The resulting structural pathways are consistent with the direct observation of the effect of the modes of vibration on the stereochemistries of the complexes. A comparison of the trends in the 29 datasets suggests a size effect of the phen, bipy and dpyam ligands.

scholarly journals Supramolecular Frameworks Based on Rhenium Clusters Using the Synthons Approach

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2662
Author(s):  
Nathalie Audebrand ◽  
Antoine Demont ◽  
Racha El Osta ◽  
Yuri V. Mironov ◽  
Nikolay G. Naumov ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Crystal Structures ◽  
Ligand Exchange ◽  
Alkaline Earth ◽  
Room Temperature ◽  
Hydration Rate ◽  
Rhenium Cluster ◽  
New Compounds ◽  
Cluster Unit

The reaction of the K4[{Re6Si8}(OH)a6]·8H2O rhenium cluster salt with pyrazine (Pz) in aqueous solutions of alkaline or alkaline earth salts at 4 °C or at room temperature leads to apical ligand exchange and to the formation of five new compounds: [trans-{Re6Si8}(Pz)a2(OH)a2(H2O)a2] (1), [cis-{Re6Si8}(Pz)a2(OH)a2(H2O)a2] (2), (NO3)[cis-{Re6Si8}(Pz)a2(OH)a(H2O)a3](Pz)·3H2O (3), [Mg(H2O)6]0.5[cis-{Re6Si8}(Pz)a2(OH)a3(H2O)a]·8.5H2O (4), and K[cis-{Re6Si8}(Pz)a2(OH)a3(H2O)a]·8H2O (5). Their crystal structures are built up from trans- or cis-[{Re6Si8}(Pz)a2(OH)a4−x(H2O)ax]x−2 cluster units. The cohesions of the 3D supramolecular frameworks are based on stacking and H bonding, as well as on H3O2−bridges in the cases of (1), (2), (4), and (5) compounds, while (3) is built from stacking and H bonding only. This evidences that the nature of the synthons governing the cluster unit assembly is dependent on the hydration rate of the unit.

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