A linear cobalt(II) complex with maximal orbital angular momentum from a non-Aufbau ground state

Science ◽  
2018 ◽  
Vol 362 (6421) ◽  
pp. eaat7319 ◽  
Author(s):  
Philip C. Bunting ◽  
Mihail Atanasov ◽  
Emil Damgaard-Møller ◽  
Mauro Perfetti ◽  
Iris Crassee ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Ground State ◽  
Dominant Role ◽  
Far Infrared ◽  
Wave Number ◽  
Ligand Field ◽  
Electron Configuration ◽  
Susceptibility Data

Orbital angular momentum is a prerequisite for magnetic anisotropy, although in transition metal complexes it is typically quenched by the ligand field. By reducing the basicity of the carbon donor atoms in a pair of alkyl ligands, we synthesized a cobalt(II) dialkyl complex, Co(C(SiMe2ONaph)3)2 (where Me is methyl and Naph is a naphthyl group), wherein the ligand field is sufficiently weak that interelectron repulsion and spin-orbit coupling play a dominant role in determining the electronic ground state. Assignment of a non-Aufbau (dx2–y2, dxy)3(dxz, dyz)3(dz2)1 electron configuration is supported by dc magnetic susceptibility data, experimental charge density maps, and ab initio calculations. Variable-field far-infrared spectroscopy and ac magnetic susceptibility measurements further reveal slow magnetic relaxation via a 450–wave number magnetic excited state.

Infrared and Electronic Spectral Studies of Cobalt(II) and Nickel(II) Complexes of N-Allyl Urea and N-Allyl Thiourea

1972 ◽  
Vol 50 (16) ◽  
pp. 2603-2609 ◽  
Author(s):  
P. P. Singh ◽  
I. M. Pande
Keyword(s):  
Magnetic Susceptibility ◽  
Electronic Spectra ◽  
Electrical Conductance ◽  
Spectral Studies ◽  
Ligand Field ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Halide Complexes ◽  
Ligand Field Parameters ◽  
Allyl Thiourea

Complexes of N-allyl urea (NAU) and N-allyl thiourea (NATU) with cobalt (II) and nickel (II) halides and perchlorates have been prepared and characterized by electrical conductance, magnetic susceptibility, infrared and electronic spectra. Infrared spectra suggest coordination in NAU through oxygen and in NATU through nitrogen. The electronic spectra and magnetic susceptibility data indicate tetrahedral and octahedral stereochemistry for cobalt (II) and nickel (II) halide complexes, respectively. The various ligand field parameters Dq, B′, and β calculated for these complexes show about 25 and 11% covalency for Co (II) and Ni (II), respectively, and suggest a weak ligand field.

scholarly journals DOUBLE-VALUEDNESS OF THE ELECTRON WAVEFUNCTION AND ROTATIONAL ZERO-POINT MOTION OF ELECTRONS IN RINGS

2010 ◽  
Vol 24 (21) ◽  
pp. 2201-2214 ◽  
Author(s):  
J. E. HIRSCH
Keyword(s):  
Angular Momentum ◽  
Aromatic Ring ◽  
Orbital Angular Momentum ◽  
Ground State ◽  
Spin Current ◽  
Zero Point ◽  
Persistent Currents ◽  
Ring Molecules ◽  
Point Motion ◽  
Electron Wavefunction

I propose that the phase of an electron's wavefunction changes by π when the electron goes around a loop maintaining phase coherence. Equivalently, that the minimum orbital angular momentum of an electron in a ring is ℏ/2 rather than zero as generally assumed, hence, that the electron in a ring has azimuthal zero point motion. This proposal implies that a spin current exists in the ground state of aromatic ring molecules and suggests an explanation for the ubiquitousness of persistent currents observed in mesoscopic rings.

Determination of ligand field splitting in lanthanide(iii) monoporphyrinato complexes

2019 ◽  
Vol 48 (22) ◽  
pp. 7685-7692 ◽  
Author(s):  
Anas Santria ◽  
Akira Fuyuhiro ◽  
Takamitsu Fukuda ◽  
Naoto Ishikawa
Keyword(s):  
Magnetic Susceptibility ◽  
Electronic Structures ◽  
Ligand Field ◽  
Field Splitting ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Ground Multiplet

The 4f-electronic structures of the ground multiplet states of a series of [Ln(TPP)(cyclen)]Cl (Ln = Tb, Dy, Ho, Er, Tm, and Yb; TPP = 5,10,15,20-tetraphenylporphyrinato; cyclen = 1,4,7,10-tetraazacyclododecane) have been determined using experimental NMR and magnetic susceptibility data.

New empirical formula for α-decay calculations

2018 ◽  
Vol 27 (08) ◽  
pp. 1850068 ◽  
Author(s):  
Dashty T. Akrawy ◽  
Ali H. Ahmed
Keyword(s):  
Experimental Data ◽  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Ground State ◽  
Empirical Formula ◽  
State Transitions ◽  
Α Decay ◽  
O Isotopes

A set of empirical formulae have been proposed to calculate the [Formula: see text]-decay half-lives from ground state to ground state transitions of 356 nuclei classified to different set of e–e, e–o, o–e and o–o isotopes. Within these formulae, modification of the previous set of Royer expressions were done by introducing three different physical terms, including the orbital angular momentum and isobaric asymmetry factors. The predicted [Formula: see text]-decay half-lives compared with those adopted by former proposed models for the depended experimental data, and significant improvements were noticed for all the studied sets of isotopes.

Orbital angular momentum (Renner–Teller) effects in the [sup 2]Π[sub i] ground state of silicon methylidyne (SiCH)

2001 ◽  
Vol 114 (2) ◽  
pp. 725 ◽  
Author(s):  
Tony C. Smith ◽  
Haiyang Li ◽  
David A. Hostutler ◽  
Dennis J. Clouthier ◽  
Anthony J. Merer
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Ground State

Splitting of Terms Beyond a D-Term in an Octahedral Ligand Field

1981 ◽  
Vol 36 (7) ◽  
pp. 735-742 ◽  
Author(s):  
J. R. Perumareddi
Keyword(s):  
Angular Momentum ◽  
Ligand Field ◽  
Electron Configuration ◽  
Cubic Symmetry ◽  
Semiquantitative Method ◽  
Quantitative Calculations

Abstract Although the procedure to calculate the ligand field energies of terms of a many d-electron configuration in cubic symmetry is known, we present a novel semiquantitative method for the splitting of d-electron terms in cubic symmetry. The method is based on quantitative calculations of one-electron orbitals of a given angular momentum. S p littin g o f T e r m s B e y o n d a D -T e r m in a n O c ta h e d r a l L ig a n d F ield

scholarly journals ULTRA-COLD GASES AND THE DETECTION OF THE EARTH'S ROTATION: BOGOLIUBOV SPACE AND GRAVITOMAGNETISM

2012 ◽  
Vol 27 (34) ◽  
pp. 1250198 ◽  
Author(s):  
A. CAMACHO ◽  
E. CASTELLANOS
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Speed Of Sound ◽  
Ground State ◽  
Single Atom ◽  
Earth’S Rotation ◽  
Cold Gases ◽  
Thermodynamical Properties ◽  
The Earth ◽  
Number Of Particles

The present work analyses the consequences of the gravitomagnetic effect of the Earth upon a bosonic gas in which the corresponding atoms have a nonvanishing orbital angular momentum. Concerning the ground state of the Bogoliubov space of this system we deduce the consequences, on the pressure and on the speed of sound, of the gravitomagnetic effect. We prove that the effect on a single atom is very small, but we also show that for some thermodynamical properties the consequences scale as a nontrivial function of the number of particles.

Hexafluoro antimonates(V) of divalent metals, synthesis and properties

1989 ◽  
Vol 67 (11) ◽  
pp. 1700-1707 ◽  
Author(s):  
M. S. R. Cader ◽  
F. Aubke
Keyword(s):  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Ground State ◽  
Low Temperatures ◽  
Weak Ferromagnetism ◽  
Ligand Field ◽  
Antiferromagnetic Exchange ◽  
Divalent Metals ◽  
Mixed Valency ◽  
Efficient Route

Solvolysis of metal(II) fluorosulfates in liquid antimony(V) fluoride according to:[Formula: see text]with M = Sn, Ni, Pd, Cu, or Ag, is found to be a clean, efficient route to the hexafluoro antimonates of the corresponding metals. Two of the compounds reported here display unusual features: Pd(SbF6)2 is, like its fluorosulfate precursor, paramagnetic with the Pd2+ ion in a 3A2g ground state, and an analysis of the ligand field spectrum is presented; Ag(SbF6)2 is, unlike a recently reported paramagnetic, blue, valence isomer, diamagnetic and nearly white in color. Formulation as a mixed valency compound Ag(I)Ag(III)(SbF6)4 is suggested. Low temperature magnetic susceptibility measurements (where appropriate), Raman, and IR data are reported. The hexafluoro antimonates of Ni, Pd, and Cu show antiferromagnetic exchange at very low temperatures. Pd(SbF6)2 shows very weak ferromagnetism below 10 K. Keywords: fluoroantimonates of divalent metals, synthesis and solvolysis in SbF5, vibrational spectra, magnetic susceptibility measurements.

THE STRUCTURE OF 11Li: A “RYDBERG” NUCLEUS?

1993 ◽  
Vol 08 (04) ◽  
pp. 295-299 ◽  
Author(s):  
T. FREDERICO ◽  
M.S. HUSSEIN
Keyword(s):  
Angular Momentum ◽  
Long Range ◽  
Orbital Angular Momentum ◽  
Ground State ◽  
Rydberg States ◽  
Efimov States

The effective long range R−2 interaction between 9Li and the two neutrons (slightly bound) is taken here responsible for the loosely bound 11Li nucleus. A large number of these loosely bound Rydberg states is expected to be generated. Similarities to Efimov states are pointed out. It is pointed out that values of the orbital angular momentum of up to 3ħ may contribute to the structure of the ground state.

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