Crystal structures of zeolites with the general formula CaAl2Si6O16·nH2O

2007 ◽  
Vol 43 (6) ◽  
pp. 651-659 ◽  
Author(s):  
T. N. Kol’tsova
Keyword(s):  
Crystal Structures ◽  
General Formula

Syntheses, crystal structures, and biological evaluations of new dinuclear platinum(II) complexes with 1,2,4-triazole derivate as bridging ligands

2021 ◽  
Author(s):  
Jianwei Wang ◽  
Xinhua Li ◽  
Caixia Yuan ◽  
Feng Su ◽  
Yanbo Wu ◽  
...  
Keyword(s):  
Crystal Structures ◽  
General Formula ◽  
Bridging Ligands ◽  
Dinuclear Platinum

A series of new dinuclear platinum(II) complexes with general formula [Pt2(μ-HL)4] (1–4), where H2L is 4-[(5-chloro-2-hydroxy-benzylidene)-amino)]-3-R-1,2,4-triazole-5-thione: R = H (1), methyl (2), ethyl (3) and propyl (4), have been synthesized...

Structural and spectroscopic studies of transition metal nitrite complexes. VIII. Crystal structures and spectra of three pentanuclear species with stoichiometry [Ni5(N-substituted ethane-1,2-diamine)4(OH)2(NO2)8]

1981 ◽  
Vol 34 (10) ◽  
pp. 2139 ◽  
Author(s):  
AJ Finney ◽  
MA Hitchman ◽  
CL Raston ◽  
GL Rowbottom ◽  
AH White
Keyword(s):  
Transition Metal ◽  
Crystal Structures ◽  
General Formula ◽  
Infrared Spectra ◽  
Spectroscopic Studies ◽  
Molecular Structures ◽  
Structural Variations ◽  
Crystal And Molecular Structures

The preparation of a series of novel compounds of general formula [Ni5L4(NO2)8(OH)2] formed by ethane-1,2-diamine or one of five N-substituted ethane-1,2-diamines (L) is described. The crystal and molecular structures of the ethane-1,2-diamine, N,N'-diethylethane-1,2-diamine and N,N-dimethylethane-1,2-diamine complexes are reported. Each compound contains a planar, pentameric arrangement of nickel(II) ions, linked by bridging hydroxide and nitrite ligands. The details of the nitrite bridges differ among the complexes, causing differences in their electronic and infrared spectra. The structural variations are probably caused by the differing steric requirements of the amine substituents.

Halogen-bonding in a new family of tris(haloanilato)metallate(iii) magnetic molecular building blocks

2014 ◽  
Vol 43 (19) ◽  
pp. 7006-7019 ◽  
Author(s):  
Matteo Atzori ◽  
Flavia Artizzu ◽  
Elisa Sessini ◽  
Luciano Marchiò ◽  
Danilo Loche ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Dft Calculations ◽  
Crystal Structures ◽  
General Formula ◽  
Halogen Bonding ◽  
Building Blocks ◽  
New Family ◽  
Molecular Building Blocks

Here we report on new tris(haloanilato)metallate(iii) complexes with general formula [M(X2An)3]3−, their crystal structures, DFT calculations and magnetic properties.

The 63,65Cu NQR Spectra of Di-coordinated CuI Cations with 2-Substituted Pyridine Ligands

1990 ◽  
Vol 45 (3-4) ◽  
pp. 224-228 ◽  
Author(s):  
Augustin Habiyakare ◽  
Edwin A. C. Lücken
Keyword(s):  
Resonance Frequency ◽  
Crystal Structures ◽  
General Formula ◽  
Copper Atom ◽  
Nitrate Anion ◽  
Pyridine Ligands ◽  
Donor Acceptor ◽  
Linear Geometry

Abstract The NQR frequencies of the 63,65 Cu nuclei in di-coordinated complex cations of Cu 1 , having the general formula CuL 2X, where L is a substituted pyridine and X is a hard anion such as ClO4 , are reported and discussed in the light of the known crystal structures. A departure from a strictly linear geometry of the L 2 Cu cation has but little effect on the resonance frequency, but the donor-acceptor bond between the nitrate anion and the copper atom in bis(2,6-lutidine)cuprous nitrate, which was postulated on crystallographic grounds, is confirmed by the NQR results, which also indicate a similar interaction in bis(2,6-lutidine)cuprous trifluoroacetate. A number of the complexes discussed here have not been reported previously.

scholarly journals Die Kristallstrukturen von Strontium- und Bariumhexacyanoferrat(III)-Hexamethylentetramin-Hydraten. Strukturmodell für Additionsverbindungen der Alkali- und Erdalkalimetallhexacyanoferrate mit Hexamethylentetramin / The Crystal Structures of Hydrates of Strontium and Barium Hexacyanoferrate(III) with Hexamethylenetetramine. Structural Model for Adducts of the Hexacyanoferrates of Alkaline and Alkaline Earth Metals with Hexamethylenetetramine

1989 ◽  
Vol 44 (5) ◽  
pp. 519-525 ◽  
Author(s):  
Hans-Jürgen Meyer ◽  
Joachim Pickardt
Keyword(s):  
Aqueous Solutions ◽  
Crystal Structures ◽  
General Formula ◽  
Alkaline Earth ◽  
Structural Model ◽  
Earth Metal ◽  
Alkaline Earth Metals ◽  
Alkaline Earth Metal ◽  
Monoclinic Space Group ◽  
Space Group

By reaction of methanolic solutions of hexamethylenetetramine with aqueous solutions of hexacyanoferrates(III) of strontium and barium resp., crystals of the compounds were obtained. Sr3[Fe(CN)6]2 · 3 C6H12N4 · 18 H2O, tetragonal, space group P42/nmc, Z = 4, a = 1931.8(4), c = 1579.9(4) pm, 1358 reflections. R = 0.066. Ba3[Fe(CN)6]2 · 2 C6H12N4 · 11 Η2Ο. monoclinic. space group P21/n, Ζ = 2, a = 1148.0(4), b = 1369.7(4), c = 1584.5(4) pm, γ = 95.79(3)°, 2583 reflections, R = 0.057. The crystal structures of these adducts are compared with those of other hexamethylenetetramine adducts of alkaline and alkaline earth metal hexacyanoferrates of the general formula M,[Fe(CN)6]y · zC6H12N4 · vH2O recently investigated by us. A structural model for the adducts is presented.

Synthesis and characterization of Hg(II) complexes of Me3MCH2SeMe, (M = Si, Ge). Crystal structures of [HgX2(Me3SiCH2SeMe)]2, X = Cl, Br, I

1987 ◽  
Vol 65 (9) ◽  
pp. 2305-2311 ◽  
Author(s):  
Raj K. Chadha ◽  
John E. Drake ◽  
Neil T. McManus ◽  
Anil Mislankar
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Raman Spectroscopy ◽  
Magnetic Resonance ◽  
Crystal Structures ◽  
General Formula ◽  
Synthesis And Characterization ◽  
Nuclear Magnetic

Complexes of the general formula [HgX2(Me3MCH2SeMe)]2, where M = Si, Ge; X = Cl, Br, I, have been prepared and characterized by 1H nuclear magnetic resonance and Raman spectroscopy. Crystal structures of [HgX2(Me3SiCH2SeMe)]2, where X = Cl, Br, and I (1, 2, and 3 respectively), show that they have centrosymmetric dinuclear structures. The crystals of 1 and 2 are monoclinic, while those of 3 are triclinic. For 1: P21/c, a = 14.235(11), b = 6.551(6), c = 14.211(9) Å, β = 117.33(5)°, Z = 2, and R = 0.0560. For 2: P21/c, a = 14.329(6), b = 6.695(2), c = 14.819(4) Å, β = 118.47(2)°, Z = 2, and R = 0.0540. For 3: [Formula: see text], a = 7.651(2), b = 8.387(2), c = 12.321(4) Å, α = 90.07(2), β = 91.80(2), γ = 116.02(2)°, Z = 1, and R = 0.0565. All three complexes show the expected pseudotetrahedral geometry about mercury. The stereochemical differences arise in the arrangement of the bulky trimethylsilylmethyl groups, which in the HgI2 adduct are rotated away from the centre of the molecule but which in the HgCl2 and HgBr2 adducts are turned towards the centre. These are the first dinuclear structures reported of HgBr2 and HgI2 adducts since it was demonstrated 46 years ago by Evans etal. that [HgBr2(AsBu3)]2 was present in [HgBr2(AsBu3)2•HgBr2].

Crystal Structures of Lanthanide and Zirconium Phosphates with General Formula Ln0.33Zr2(PO4)3, Where Ln: Ce, Eu, Yb.

ChemInform ◽  
2006 ◽  
Vol 37 (51) ◽  
Author(s):  
D. M. Bykov ◽  
E. R. Gobechiya ◽  
Yu. K. Kabalov ◽  
A. I. Orlova ◽  
S. V. Tomilin
Keyword(s):  
Crystal Structures ◽  
General Formula ◽  
Zirconium Phosphates
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