Cation-Directed Synthesis of Tungstosilicates. 1. Syntheses and Structures of K10A-α-[SiW9O34]·24H2O, of the Sandwich-Type Complex K10.75[Co(H2O)6]0.5[Co(H2O)4Cl]0.25A-α-[K2{Co(H2O)2}3(SiW9O34)2]·32H2O and of Cs15[K(SiW11O39)2]·39H2O

2003 ◽  
Vol 42 (19) ◽  
pp. 5857-5862 ◽  
Author(s):  
Nathalie Laronze ◽  
Jérôme Marrot ◽  
Gilbert Hervé
Keyword(s):  
Type Complex ◽  
Directed Synthesis ◽  
Sandwich Type

The Synthesis and Biological Function of a Novel Sandwich‐Type Complex Based on {SbW 9 } and Flexible bpp Ligand

2019 ◽  
Vol 8 (18) ◽  
pp. 1900471 ◽  
Author(s):  
Lu Wang ◽  
Shubin Li ◽  
Yu Kai ◽  
Jiang Zhu ◽  
Huijie Shi ◽  
...  
Keyword(s):  
Biological Function ◽  
Type Complex ◽  
Sandwich Type

Preparation and Characterization of a Novel Gadolinium Triple-Decker Sandwich-Type Complex with Tetrabenzoporphyrin Ligand

2013 ◽  
Vol 690-693 ◽  
pp. 573-576
Author(s):  
Qi Feng Liu
Keyword(s):  
Room Temperature ◽  
Spectroscopic Properties ◽  
Magnetic Interactions ◽  
Antiferromagnetic Coupling ◽  
Magnetic Studies ◽  
Conjugated Systems ◽  
Type Complex ◽  
Vis Spectroscopy ◽  
Sandwich Type

A novel gadolinium triple-decker sandwich-type complex containing tetrabenzoporphyrin (TBP) ligands-Gd (TBP)3was prepared from porphyrin 1 and Gd (acac)3.nH2O in boiling 1, 2, 4-Tcb for 45~48 h under Ar. Its structure is characterized by Uv-Vis spectroscopy and HR-MS. The spectroscopic properties show that its longest-wavelength visible band (600-800 nm) is obviously red-shifted due to the extension of the π conjugated systems derived from the linear benzoannulation in the TBP ring. The magnetic studies also indicate that there is no magnetic interactions between two Gd (III) ions in the triple-deckers in the range from room temperature down to 20K and very weak antiferromagnetic coupling exists between two Gd (III) ions below 20K.

Spectroscopy studies of sandwich-type complex of silver(I) co-ordinated to nuclear fast red and adenine and its analytical applications

2015 ◽  
Vol 69 (4) ◽  
Author(s):  
Yi Cui ◽  
Yi-Jun Gong ◽  
Li Su ◽  
Cheng-Ke Wu ◽  
Sheng-Bin Pang ◽  
...  
Keyword(s):  
Rayleigh Scattering ◽  
Optical Probe ◽  
Resonance Rayleigh Scattering ◽  
Fluorometric Method ◽  
Type Complex ◽  
Fast Red ◽  
Sandwich Type ◽  
Nuclear Fast Red ◽  
Spectroscopy Studies

AbstractA novel fluorometric method for the determination of adenine was proposed, based on the fluorescence quenching of a nuclear fast red-silver complex as a small molecule optical probe in the presence of adenine. The characteristic spectra of absorption, resonance Rayleigh scattering (RRS) and the fluorescence of the system were analysed. Adenine, Ag

scholarly journals Synthesis and Crystal Structure of a Sandwich-type Transition Metal Complex with Tungstobismutate and Triethanolamine

2009 ◽  
Vol 64 (7) ◽  
pp. 821-825 ◽  
Author(s):  
Xiuhong Xu ◽  
Ling Zhang ◽  
Yi Zhang ◽  
Bin Qi ◽  
Fang Luo
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Transition Metal Complex ◽  
Crystal Data ◽  
X Ray Diffraction ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Hydrogen Bonding Interactions ◽  
Type Complex ◽  
Sandwich Type

The sandwich-type complex Na(H2O)6(C6H16O3N)2[Na2(H2O)7(C6H16O3N)]2[(Na(H2O)2)3- (Cu(H2O))3(BiW9O33)2]・14H2O (1) (C6H16O3N+ = protonated triethanolamine) has been synthesized and structurally characterized by single-crystal X-ray diffraction, IR spectroscopy and TG analysis. The basic framework of 1 is built from a sandwich-type [(Na(H2O)2)3- (Cu(H2O))3(BiW9O33)2]9− anion, two [Na2(H2O)7(C6H16O3N)]3+ cations, a free Na(H2O)6+ cation, and two free C6H16O3N+ units. In compound 1, the [(Na(H2O)2)3(Cu(H2O))3- (BiW9O33)2]9− anion links two bi-nuclear units [Na2(H2O)7(C6H16O3N)]3+ to form a [Na2- (H2O)7(C6H16O3N)]2[(Na(H2O)2)3(Cu(H2O))3(BiW9O33)2]3− cluster, and a new 3D supramolecular structure is further constructed by hydrogen bonding interactions among this cluster, the free Na(H2O)6+ cation, and the free C6H16O3N+ cations. Crystal data: Cu3Na8Bi2W18C24H150O121N4, monoclinic, C2/c, a = 14.5668(13), b = 23.0405(13), c = 37.412(2) Å , β = 91.569(10)° , Z = 4.

scholarly journals Aromatic B3 Ring Stabilized Group 2 Dimer, B3-Y-Y-B3 (Y = Be, Mg, Ca)

2021 ◽  
Author(s):  
Ritam Borah ◽  
Amlan Kalita ◽  
Farnaz Yashmin ◽  
Kangkan Sarma ◽  
Rinu Deka ◽  
...  
Keyword(s):  
Complex Formation ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Thermodynamic Consideration ◽  
Type Complex ◽  
Sandwich Type ◽  
Group 2

Quantum chemical calculations have been performed on B3 ring stabilized Y-Y interaction (Y = Be, Mg, Ca) to understand the possibility of binuclear sandwich type complex formation. Calculations indicate single reference character of the studied systems. The complexes have been found to be stable towards dissociation into different fragments. Thermodynamic consideration also indicates the favourability of their formation. Increase in aromaticity of the parent B3 ring upon complexation is observed which is expected to provide extra stability to the complexes.

Synthesis, Properties of Gadolinium Double-Decker Sandwich-Type Complex Containing Tetrabenzoporphyrin Ligand

2012 ◽  
Vol 190-191 ◽  
pp. 571-574 ◽  
Author(s):  
Hai Yun Xu ◽  
Chun Hua Hu ◽  
Qi Feng Liu ◽  
Wen Xian Zhao ◽  
Ying Liu
Keyword(s):  
Spin Exchange ◽  
Spectroscopic Characterization ◽  
Spectroscopic Properties ◽  
Ir Absorption ◽  
Magnetic Studies ◽  
Group 4 ◽  
Type Complex ◽  
Double Decker ◽  
Synthesis Properties ◽  
Sandwich Type

A novel gadolinium double-decker sandwich-type complex with tetrabenzoporphyrin (TBP) ligands-Gd(TBP)2 was synthesized by the reaction of porphyrin 1 with Gd(acac)3. nH2O in boiling 1, 2, 4-Tcb for 15~17 h under Ar. Its structure is characterized byUv-Vis-NIR and HR-MS. The spectroscopic properties show that the longest-wavelength visible band (600-800 nm) and the strong near-IR absorption band centered near 1340 nm of Gd (TBP)2 complex are obviously red-shifted due to the extension of the π conjugated systems derived from the linear benzoannulation in the TBP ring. The magnetic studies also indicate that the observed value of χMT of Gd(TBP)2 complex is close to the combined value of Gd(III) and porphyrin radical anion at room temperature, and antiferromagnetic interaction that possibly results from the intramolecular spin exchange between the porphyrin π-radical electron, and the gadolinium f unpaired electrons dominates its magnetic properties over the whole temperature range. Since the first report of bis(porphyrinato) metal complexes M(Por)2 such as a cerium(IV) bisporphyrinate, Ce(TPP)2 and hydrogen praseodymium(III), PrH(TPP)2 in 1983[1], sandwich-type rare earth complexes with porphyrin ligands have received increasing attentions due to the unusual physical, spectroscopic, redox, electron transfer, and/or conductivity properties resulting from their strong π-π interactions[2-4]. Whereas the chemistry and properties of homoleptic sandwich complexes containing the same pophyrinato ligands of various lanthanide, actinides and group 4 transition metals have been extensively studied[5-6], actually all of them are confined to the sandwich-type complexes containing meso-substituted porphyrin ligands except for octaethylporphyrin (OEP) or octamethylporphyrin (OMP). Little is known about sandwich-like complexes with aromatic ring-fused porphyrin ligands that contain a more delocalized π system. In this paper, we will describe the preparation of a novel gadolinium homoleptic double-decker sandwich-type complex with tetrabenzoporphyrin (TBP) ligand (see Fig.1) as well as their spectroscopic characterization and magnetic studies.

Yttrium Polyoxometalates. Synthesis and Characterization of a Carbonate-Encapsulated Sandwich-Type Complex

2003 ◽  
Vol 42 (26) ◽  
pp. 8600-8602 ◽  
Author(s):  
Xikui Fang ◽  
Travis M. Anderson ◽  
Wade A. Neiwert ◽  
Craig L. Hill
Keyword(s):  
Synthesis And Characterization ◽  
Type Complex ◽  
Sandwich Type

Yttrium Polyoxometalates. Synthesis and Characterization of a Carbonate-Encapsulated Sandwich-Type Complex.

ChemInform ◽  
2004 ◽  
Vol 35 (10) ◽  
Author(s):  
Xikui Fang ◽  
Travis M. Anderson ◽  
Wade A. Neiwert ◽  
Craig L. Hill
Keyword(s):  
Synthesis And Characterization ◽  
Type Complex ◽  
Sandwich Type

An HREM study of crystal imperfections in epitaxial lanthanide phthalocyanine films

1988 ◽  
Vol 46 ◽  
pp. 944-945
Author(s):  
W. P. Zhang ◽  
K. H. Kuo
Keyword(s):  
Thin Films ◽  
Crystal Growth ◽  
Electron Interaction ◽  
Geometric Isomers ◽  
Physical Behavior ◽  
Local Structures ◽  
Crystal Imperfections ◽  
Type Complex ◽  
Sandwich Type ◽  
Molecular Images

Because of their interesting electrochromic and gas-sensitive properties, lanthanide phthalocyanine (LnPc2H) films have received much attention recently. It is important to know the local structures of these films for understanding their chemical and physical behavior. LnPc2H is a sandwich-type complex (Fig. 1 (a)), with an ion at the center between two parallel phthalocyanine ligands which are rotated respectively by an angle of about 37°. As shown in Fig. 1 (c), two geometric isomers appear resulting from the different sense of rotation of two ligands. With the strong n-electron interaction between the molecular planes, these molecules tend to form molecular columns (Fig. 1 (b)) during crystal growth so that molecular images can be obtained along the column axis.Thin films of LnPc2H (Ln = Nd, Tb, Er, Tm, Yb and Lu) were epitaxially prepared on KC1 and NaCl substrates. The KC1 and NaCl crystals were cleaved along (100) in air and immediately placed into a vacuum evaporator.

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