Tri(cyclopentadienylmanganese)tetranitrosyl. A metal cluster compound with doubly and triply bridging nitrosyl groups

1967 ◽  
Vol 89 (14) ◽  
pp. 3645-3646 ◽  
Author(s):  
Richard C. Elder ◽  
F. Albert. Cotton ◽  
Robert A. Schunn
Keyword(s):  
Metal Cluster ◽  
Cluster Compound

Characterization and structure of lanthanum rhenate, a new metal cluster compound

1968 ◽  
Vol 7 (1) ◽  
pp. 108-111 ◽  
Author(s):  
John M. Longo ◽  
Arthur W. Sleight
Keyword(s):  
Metal Cluster ◽  
Cluster Compound

The electronic quantum size effect observed by195Pt NMR in the metal cluster compound Pt309Phen 36 * O30

1993 ◽  
Vol 26 (S1) ◽  
pp. 21-23 ◽  
Author(s):  
D. Putten ◽  
H. B. Brom ◽  
J. Witteveen ◽  
L. J. Jongh ◽  
G. Schmid
Keyword(s):  
Size Effect ◽  
Metal Cluster ◽  
Quantum Size Effect ◽  
Cluster Compound ◽  
Quantum Size

Electronic and Geometric Structure of the Cluster Compound Au55[P(C6H5)3]12Cl6. A Computational Study

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1246-1258 ◽  
Author(s):  
Alexander Genest ◽  
Sven Krüger ◽  
Notker Rösch
Keyword(s):  
Geometric Structure ◽  
Density Functional ◽  
Present Model ◽  
Computational Study ◽  
Metal Cluster ◽  
Cluster Compound ◽  
Unresolved Issue ◽  
Metal Core ◽  
Interatomic Distances ◽  
Model Cluster

Relativistic density functional calculations have been carried out on the model cluster Au55(PH3)12Cl6 assuming a cuboctahedral or an icosahedral Au55 metal core to model the experimentally suggested cluster compound assigned as Au55[P(C6H5)3]12Cl6. Besides the overall shape of the metal core, the study focused on the unresolved issue at which sites the chlorine ligands are attached. The calculations reproduce characteristic interatomic distances within ∼ 2 pm, with the exception of the Au-Cl bonds. Chlorine ligands were calculated to prefer higher coordinated sites whereas the previously postulated on-top coordination at the center of the Au (100) facets of a cuboctahedron was found to be unstable. In fact, the present model results suggest an ensemble of several higher coordinated sites. The often assumed cuboctahedral shape of the metal cluster core was determined to be slightly less stable than an approximately icosahedral shape. The calculations allow a rationalization of the difficulties faced in experiments that attempted to discriminate cluster isomers

Magnetization Studies of Superconductivity in a Molecular Metal Cluster Compound

2007 ◽  
Vol 633 (13-14) ◽  
pp. 2173-2177 ◽  
Author(s):  
D. Bono ◽  
O.N. Bakharev ◽  
A. Schnepf ◽  
J. Hartig ◽  
H. Schnöckel ◽  
...  
Keyword(s):  
Metal Cluster ◽  
Cluster Compound

Reentrant Structural and Optical Properties of Organic–Inorganic Hybrid Metal Cluster Compound ((n-C4H9)4N)2[Mo6Bri8Bra6]

CrystEngComm ◽  
2022 ◽  
Author(s):  
Norio Saito ◽  
Daiki Nishiyama ◽  
Yoshitaka Matsushita ◽  
Yoshiki Wada ◽  
Stéphane Cordier ◽  
...  
Keyword(s):  
Phase Transition ◽  
Optical Properties ◽  
Monoclinic Phase ◽  
Metal Cluster ◽  
Cluster Compound ◽  
Structural Studies ◽  
Structural And Optical Properties ◽  
Inorganic Hybrid

We report the reentrant phase transition of the organic–inorganic hybrid metal cluster (MC) compound (TBA)2[Mo6Bri8Bra6] (TBA = ((n-C4H9)4N)). Structural studies revealed that (TBA)2[Mo6Bri8Bra6] was crystallized in the conventional monoclinic phase...

scholarly journals A New {Dy5} Single-Molecule Magnet Bearing the Schiff Base Ligand N-Naphthalidene-2-amino-5-chlorophenol

2018 ◽  
Vol 4 (4) ◽  
pp. 48
Author(s):  
Dimitris Alexandropoulos ◽  
Alysha Alaimo ◽  
Di Sun ◽  
Theocharis Stamatatos
Keyword(s):  
Magnetic Susceptibility ◽  
Schiff Base ◽  
Single Molecule ◽  
Schiff Base Ligand ◽  
Metal Cluster ◽  
Relaxation Times ◽  
Exchange Interactions ◽  
Common Vertex ◽  
Cluster Compound ◽  
Single Molecule Magnet

A new {Dy5} cluster compound has been synthesized and structurally characterized from the initial use of the Schiff base ligand N-naphthalidene-2-amino-5-chlorophenol (nacpH2) in coordination chemistry. The 1:1 reaction between Dy(hpd)3∙2H2O and nacpH2, in a solvent mixture comprising CH2Cl2 and MeOH, afforded orange crystals of [Dy5(OH)2(hpd)3(nacp)5(MeOH)5] (1) in 70% yield, where hpd− is the anion of 3,5-heptadione. The {Dy5} complex can be described as two vertical {Dy3(μ3-OH)}8+ triangles sharing a common vertex; such a metal topology is unprecedented in 4f-metal cluster chemistry. Direct current (dc) magnetic susceptibility studies revealed the presence of some weak ferromagnetic exchange interactions between the five DyIII ions at low temperatures. Alternating current (ac) magnetic susceptibility measurements at zero applied dc field showed that complex 1∙3MeOH∙CH2Cl2 exhibits temperature- and frequency-dependent out-of-phase signals below ~20 K, characteristics of a single-molecule magnet (SMM). The resulting relaxation times were used to construct an Arrhenius-type plot and determine an effective energy barrier, Ueff, of 100 K for the magnetization reversal. The application of a small dc field of 200 Oe resulted in the surpassing of the quantum tunneling process and subsequently the increase of the Ueff to a value of 170 K. The reported results are part of a long-term program aiming at the preparation of structurally and magnetically interesting lanthanide complexes bearing various Schiff base chelating/bridging ligands.

Schwingungsspektren der Clusterverbindung Nb6F15/Vibrational Spectrum of the Cluster Compound Nb6F15

1989 ◽  
Vol 44 (1) ◽  
pp. 74-78 ◽  
Author(s):  
G. Kliche ◽  
H. G. von Schnering
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectrum ◽  
Vibrational Spectrum ◽  
Raman Spectra ◽  
Metal Cluster ◽  
Cluster Compound ◽  
Vibrational Modes ◽  
Infrared And Raman Spectra ◽  
Normal Coordinate ◽  
Valence Force

Abstract Infrared and Raman spectra of the metal cluster compound [Nb6F12]F3 (cubic Im3̄m; Z = 2) are reported. The three intense m odes observed in the Raman spectrum at 215. 267, and 337 cm-1 and a weak mode observed in the infrared spectrum at 287 cm-1 are assigned to the T2g, Eg, A1g, and T1u vibrational modes of the Nb6 octahedra. The assignment is supported by normal coordinate analysis and Raman measurements at 47 kbar. The valence force constants are f(Nb-Fi) = 2.04, f(Nb-Fa-a) = 1.30 and f(Nb-Nb) = 0.97 N cm-1 metal-to-metal interaction in the cluster.

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