Density functional studies on lanthanide (III) texaphyrins (Ln
... results of first-principles electronic structure calculations are not available. The numerous experimental studies for complexes with different lanthanide centers and different ligand side chains in varying solvents make a systematic theoretical study of trends along the lanthanide series desirable. ...
... results of first-principles electronic structure calculations are not available. The numerous experimental studies for complexes with different lanthanide centers and different ligand side chains in varying solvents make a systematic theoretical study of trends along the lanthanide series desirable. ...
D AND F BLOCK ELEMENT
... (iii) Most of the complexes of transition metals are coloured. This is because of the absorption of radiation from visible light region to promote an electron from one of the d−orbitals to another. In the presence of ligands, the d-orbitals split up into two sets of orbitals having different energie ...
... (iii) Most of the complexes of transition metals are coloured. This is because of the absorption of radiation from visible light region to promote an electron from one of the d−orbitals to another. In the presence of ligands, the d-orbitals split up into two sets of orbitals having different energie ...
IJCA 49A(2) 171-175
... depend on central atom mass. Therefore, the bands at 320 and 280 cm-1 may be assigned to the v(M-X) stretching vibrations15, 320-294 cm-1 to ν(N-M-N) stretching bands and 490-458 cm-1 peaks to ν(M-N) stretching. Weak absorption peaks in the region 1335-1290 cm-1 are more complex to identify. However ...
... depend on central atom mass. Therefore, the bands at 320 and 280 cm-1 may be assigned to the v(M-X) stretching vibrations15, 320-294 cm-1 to ν(N-M-N) stretching bands and 490-458 cm-1 peaks to ν(M-N) stretching. Weak absorption peaks in the region 1335-1290 cm-1 are more complex to identify. However ...
Electron bubbles in liquid 4He containing a small
... wall of the bubble. Quantum zero-point motion results in a finite thickness for this layer as considered by Shikin [15] and by Salomaa and Williams [13,16]. (5) As far as we know, there has been very little study of the stability of bubbles containing small numbers of electrons. The stability of a b ...
... wall of the bubble. Quantum zero-point motion results in a finite thickness for this layer as considered by Shikin [15] and by Salomaa and Williams [13,16]. (5) As far as we know, there has been very little study of the stability of bubbles containing small numbers of electrons. The stability of a b ...
CHAPTER 8 PERIODIC RELATIONSHIPS AMONG THE ELEMENTS
... You should realize that the metal ion in question is a transition metal ion because it has five electrons in the 3d subshell. Remember that in a transition metal ion, the (n−1)d orbitals are more stable than the ns orbital. Hence, when a cation is formed from an atom of a transition metal, electrons ...
... You should realize that the metal ion in question is a transition metal ion because it has five electrons in the 3d subshell. Remember that in a transition metal ion, the (n−1)d orbitals are more stable than the ns orbital. Hence, when a cation is formed from an atom of a transition metal, electrons ...
Chapter: The d and f Block Elements
... (ii)Because Mn3+ has the outer electronic configuration of 3d4 and Mn2+ has the outer electronic configuration of 3d5. Thus, the conversion of Mn3+ to Mn2+ will be a favourable reaction since 3d5 is a very stable configuration as it is half filled configuration. Hence, Eo value for Mn3+ / Mn2+ coupl ...
... (ii)Because Mn3+ has the outer electronic configuration of 3d4 and Mn2+ has the outer electronic configuration of 3d5. Thus, the conversion of Mn3+ to Mn2+ will be a favourable reaction since 3d5 is a very stable configuration as it is half filled configuration. Hence, Eo value for Mn3+ / Mn2+ coupl ...
CHM 423 Coordination Chemistry
... INTRODUCTION Coordination Chemistry involves the study of coordination compounds, their structures, properties and applications. The term ‘Coordination’ used to describe these compounds stems from the nature of chemical bond that leads to the formation of these compounds. This chemical bond called c ...
... INTRODUCTION Coordination Chemistry involves the study of coordination compounds, their structures, properties and applications. The term ‘Coordination’ used to describe these compounds stems from the nature of chemical bond that leads to the formation of these compounds. This chemical bond called c ...
Synthesis and physico-chemical studies on transition metal
... N1· II and Zn II ; X=CI, NO) have been prepared by the template condensation reaction of2-6-diacetylpyridine dihydrazone, ' L ' and formaldehyde in methanol medium in a 2:2 ratio (Scheme 1). An attempt was made to synthesize metal free macrocyclic li gand which resulted in an oily product. All the c ...
... N1· II and Zn II ; X=CI, NO) have been prepared by the template condensation reaction of2-6-diacetylpyridine dihydrazone, ' L ' and formaldehyde in methanol medium in a 2:2 ratio (Scheme 1). An attempt was made to synthesize metal free macrocyclic li gand which resulted in an oily product. All the c ...
A Nontwisted, Ferromagnetically Coupled MnIII3O Triangular
... a [MnIII3(µ3-O)]7+ triangular core. The latter is not uncommon in MnIII chemistry:5,13 there are antiferromagnetically coupled complexes of the general formula [Mn3O(O2CR)6L3]+ (L ) monodentate ligand) and recently the [MnIII3O(O2CR)3(mpko)3]+ family of carboxylato/ oximato complexes that are ferrom ...
... a [MnIII3(µ3-O)]7+ triangular core. The latter is not uncommon in MnIII chemistry:5,13 there are antiferromagnetically coupled complexes of the general formula [Mn3O(O2CR)6L3]+ (L ) monodentate ligand) and recently the [MnIII3O(O2CR)3(mpko)3]+ family of carboxylato/ oximato complexes that are ferrom ...
Full text - SG
... spin-unrestricted calculations were performed using the Gaussian 03 program (revision C.01).25 Optimized geometries were calculated using the BP8626,27 and B3LYP28 exchange-correlation functionals with the triple-ζ 6-311+G(d) basis set. The B3LYP functional with the triple-ζ 6-311+G(d) basis set was ...
... spin-unrestricted calculations were performed using the Gaussian 03 program (revision C.01).25 Optimized geometries were calculated using the BP8626,27 and B3LYP28 exchange-correlation functionals with the triple-ζ 6-311+G(d) basis set. The B3LYP functional with the triple-ζ 6-311+G(d) basis set was ...
Theoretical Studies of Oxidative Addition and Reductive Elimination
... and inhibited by electron donors5fand that an upfield shift of the vinyl carbon resonance occurs in the 13C NMR of Ir(COD)2+(COD = 1,5-cyclooctadiene)on addition of HP5g Summarizing, the oxidative addition of H2, CHI, and C2H, to d10 metal centers should be thought of in terms of promoting a n elect ...
... and inhibited by electron donors5fand that an upfield shift of the vinyl carbon resonance occurs in the 13C NMR of Ir(COD)2+(COD = 1,5-cyclooctadiene)on addition of HP5g Summarizing, the oxidative addition of H2, CHI, and C2H, to d10 metal centers should be thought of in terms of promoting a n elect ...
Magnetic Exchange Coupling in Actinide
... exchange interactions, including multiuranium, uranium-lanthanide, uranium-transition metal, and uranium-radical species. Interpretation of the magnetic susceptibility data for compounds of this type is complicated by the combination of spin-orbit coupling and ligand-field effects arising for actini ...
... exchange interactions, including multiuranium, uranium-lanthanide, uranium-transition metal, and uranium-radical species. Interpretation of the magnetic susceptibility data for compounds of this type is complicated by the combination of spin-orbit coupling and ligand-field effects arising for actini ...
Indiene 2D Monolayer: a New Nanoelectronic Material
... They exhibit buckled monolayer structures due to the hybridization of sp2 and sp3 orbitals. Much progress has been done in the case of these materials as they have already been experimentally verified, although only on substrates and not as the standalone materials 19–21 . They have much larger band ...
... They exhibit buckled monolayer structures due to the hybridization of sp2 and sp3 orbitals. Much progress has been done in the case of these materials as they have already been experimentally verified, although only on substrates and not as the standalone materials 19–21 . They have much larger band ...
Coordination Chemistry
... tooth). Where two donor atoms can be used to bind to a metal ion, as with H2NCH2CH2NH2, the ligand is said to be bidentate, and where several donor atoms are present in a single ligand as with N(CH2CH2NH2)3, the ligand is said to be polydentate. When a bi- or polydentate ligand uses two or more dono ...
... tooth). Where two donor atoms can be used to bind to a metal ion, as with H2NCH2CH2NH2, the ligand is said to be bidentate, and where several donor atoms are present in a single ligand as with N(CH2CH2NH2)3, the ligand is said to be polydentate. When a bi- or polydentate ligand uses two or more dono ...
IOSR Journal of Applied Chemistry (IOSR-JAC) e-ISSN: 2278-5736.
... In aqueous solutions Cu2+ (d9) is tetragonally coordinated by six water molecules. Two axial water molecules lie at longer distances from the copper and are more labile than the four other water molecules. The hydrated nickel ion presents regular octahedral configuration. Six equivalent sites of coo ...
... In aqueous solutions Cu2+ (d9) is tetragonally coordinated by six water molecules. Two axial water molecules lie at longer distances from the copper and are more labile than the four other water molecules. The hydrated nickel ion presents regular octahedral configuration. Six equivalent sites of coo ...
Fall 2013 Final practice questions w/o solution
... 8. Which statement best explains why the electron affinity of B is less positive than that of Li? A) B has electrons in p orbitals, so it is lower in energy. B) Li does not want to gain an electron because it already has a half-full s orbital. C) B is a smaller atom, so its valence electrons are mo ...
... 8. Which statement best explains why the electron affinity of B is less positive than that of Li? A) B has electrons in p orbitals, so it is lower in energy. B) Li does not want to gain an electron because it already has a half-full s orbital. C) B is a smaller atom, so its valence electrons are mo ...
full text pdf
... (i) molecular organic/inorganic hybrid materials with organic π-donors [1-3], (ii) molecular based magnetic materials as building block to prepare of poly- and bimetallic compounds [4-6], (iii) magneto- and non-linear optics [7,8], and (iv) microporous materials [9]. Special attention is dedicated t ...
... (i) molecular organic/inorganic hybrid materials with organic π-donors [1-3], (ii) molecular based magnetic materials as building block to prepare of poly- and bimetallic compounds [4-6], (iii) magneto- and non-linear optics [7,8], and (iv) microporous materials [9]. Special attention is dedicated t ...
Topic 18 - Coordination Compounds
... ligand has two points of attachment. E. Coordination number 1. The coordination number is the total number of bonds the metal ion forms with the ligands – the total number of attachments between metal and ligands. 2. Some metal ions always exhibit the same coordination number: Cr3+ and Co3+ always c ...
... ligand has two points of attachment. E. Coordination number 1. The coordination number is the total number of bonds the metal ion forms with the ligands – the total number of attachments between metal and ligands. 2. Some metal ions always exhibit the same coordination number: Cr3+ and Co3+ always c ...
AL CHEMISTRY
... The addition of an aqueous solution of KSCN to a solution containing Fe(III) ions gives a complex with a deep red colour. The deep red colour fades when excess NaF solution is added. On the addition of dilute alkali to the resulting solution, a brown precipitate forms. [93I 2(b)(iv)] (3 marks) 24. G ...
... The addition of an aqueous solution of KSCN to a solution containing Fe(III) ions gives a complex with a deep red colour. The deep red colour fades when excess NaF solution is added. On the addition of dilute alkali to the resulting solution, a brown precipitate forms. [93I 2(b)(iv)] (3 marks) 24. G ...
IOSR Journal of Applied Chemistry (IOSR-JAC)
... Coumarin (2H-1-benzopyran-2-one), the parent molecule of coumarin derivatives, is the simplest compound of a large class of naturally occurring phenolic substances made of fused benzene and -pyrone rings [1]. The pharmacological and biochemical properties and therapeutic applications of simple coum ...
... Coumarin (2H-1-benzopyran-2-one), the parent molecule of coumarin derivatives, is the simplest compound of a large class of naturally occurring phenolic substances made of fused benzene and -pyrone rings [1]. The pharmacological and biochemical properties and therapeutic applications of simple coum ...
Jahn–Teller effect
The Jahn–Teller effect, sometimes also known as Jahn–Teller distortion, describes the geometrical distortion of molecules and ions that is associated with certain electron configurations. This electronic effect is named after Hermann Arthur Jahn and Edward Teller, who proved, using group theory, that orbital nonlinear spatially degenerate molecules cannot be stable. The Jahn–Teller theorem essentially states that any nonlinear molecule with a spatially degenerate electronic ground state will undergo a geometrical distortion that removes that degeneracy, because the distortion lowers the overall energy of the species. For a description of another type of geometrical distortion that occurs in crystals with substitutional impurities see article off-center ions.