Instructions for Preparing Manuscript for Bulletin of
... chain that varies between different amino acids. These molecules are particularly important in biochemistry, where this term refers to α-amino acids with the general formula H2NCHRCOOH, where R is an organic substituent. Amino acids containing uncharged amino groups, at physiological pH values, may ...
... chain that varies between different amino acids. These molecules are particularly important in biochemistry, where this term refers to α-amino acids with the general formula H2NCHRCOOH, where R is an organic substituent. Amino acids containing uncharged amino groups, at physiological pH values, may ...
Short Communication
... In analogy to other cyanide-bridged binuclear complexes [lc, 2, 171 the electronic coupling of the mononuclear components of A is apparently rather weak, since they preserve largely their identity in the trinuclear complex. The assumption that the metals occur in their regular oxidation states is su ...
... In analogy to other cyanide-bridged binuclear complexes [lc, 2, 171 the electronic coupling of the mononuclear components of A is apparently rather weak, since they preserve largely their identity in the trinuclear complex. The assumption that the metals occur in their regular oxidation states is su ...
B H B H - B H 2- B H 2-
... single crystals of this compound and have determined its structure from X-ray diffraction data (26). The compound crystallizes as colourless needles in the monoclinic space group P21/c and the structure is illustrated in Fig.3. The copper(I) atom is essentially trigonal planar with bond angles P(1)- ...
... single crystals of this compound and have determined its structure from X-ray diffraction data (26). The compound crystallizes as colourless needles in the monoclinic space group P21/c and the structure is illustrated in Fig.3. The copper(I) atom is essentially trigonal planar with bond angles P(1)- ...
double bond
... •Other atoms form stable molecule by filling their outer s and p orbitals with 8 electrons. ...
... •Other atoms form stable molecule by filling their outer s and p orbitals with 8 electrons. ...
Section A
... This type of bonding is not unique to CO; it also applies to N2, CN-, NO+ (an isoelectronic series) and many others ...
... This type of bonding is not unique to CO; it also applies to N2, CN-, NO+ (an isoelectronic series) and many others ...
Bond Order and Chemical Properties of BF, CO
... theory is that when the atomic orbitals are more disparate in energy, the interaction will be weaker and the resulting molecular orbital will be composed of greater character from the atomic orbital closest in energy.11 Furthermore, because orbital energies become more negative with increasing elect ...
... theory is that when the atomic orbitals are more disparate in energy, the interaction will be weaker and the resulting molecular orbital will be composed of greater character from the atomic orbital closest in energy.11 Furthermore, because orbital energies become more negative with increasing elect ...
Coordination Chemistry
... If two or more electrons are present in a sub-shell of an atom, these electrons are not independent of each other but these electrons interact with each other and result in the formation of a ground state (lowest energy state) and one or more excited states for the atom or ion. In addition to the el ...
... If two or more electrons are present in a sub-shell of an atom, these electrons are not independent of each other but these electrons interact with each other and result in the formation of a ground state (lowest energy state) and one or more excited states for the atom or ion. In addition to the el ...
(b) Costes, J - Nanyang Technological University
... The eight-coordination sphere of Gd is completed by a chelating nitrate anion forming with the six carboxyl oxygen atoms a distorted dodecahedron with Gd-O bond distances varying from 2.299(5) to 2.463(7) Å and the two trapezia defined by O(21), O(1), O(1A), O(21A) and O(11), O(31), O(31A), O(11A) i ...
... The eight-coordination sphere of Gd is completed by a chelating nitrate anion forming with the six carboxyl oxygen atoms a distorted dodecahedron with Gd-O bond distances varying from 2.299(5) to 2.463(7) Å and the two trapezia defined by O(21), O(1), O(1A), O(21A) and O(11), O(31), O(31A), O(11A) i ...
Abstract - Online International Interdisciplinary Research Journal
... band of the shortest wavelength appeared at 233 and 252 nm may be assigned to the π→π* transition in the benezenoid moieties. The third band appears at 321.5 nm may be assigned to n→π* of the carbonyl group. These bands are shifted to higher or lower energy on complexation indicating the participati ...
... band of the shortest wavelength appeared at 233 and 252 nm may be assigned to the π→π* transition in the benezenoid moieties. The third band appears at 321.5 nm may be assigned to n→π* of the carbonyl group. These bands are shifted to higher or lower energy on complexation indicating the participati ...
Inorganic Chemistry Presentation
... involves ET from ligand bridge to the diesterbpy ligands (?) ...
... involves ET from ligand bridge to the diesterbpy ligands (?) ...
Rare Oxidation-State Combinations and Unusual Structural Motifs in
... oxidizing agent used (O2, I2, and MnO4-) and the inorganic anion present (Br-/N3- and ClO4-) seem to affect the final product. Solid-state direct-current magnetic susceptibility (χM) data on dried 1-3 were collected under a 0.1 T field in the 5.0300 K range (Figure S1 in the Supporting Information). ...
... oxidizing agent used (O2, I2, and MnO4-) and the inorganic anion present (Br-/N3- and ClO4-) seem to affect the final product. Solid-state direct-current magnetic susceptibility (χM) data on dried 1-3 were collected under a 0.1 T field in the 5.0300 K range (Figure S1 in the Supporting Information). ...
final1-finalreportsummary
... DNA cleavage studies investigated via gel-electrophoresis, show that the complexes can cleave the DNA at low micromolar concentration with a oxidative mechanism. For the DNA binding and cleavage analyses a similar trend is observed for the complexes, 5 6 1 2 3 4. The necuproine scaffold in ...
... DNA cleavage studies investigated via gel-electrophoresis, show that the complexes can cleave the DNA at low micromolar concentration with a oxidative mechanism. For the DNA binding and cleavage analyses a similar trend is observed for the complexes, 5 6 1 2 3 4. The necuproine scaffold in ...
Spin crossover
Spin Crossover (SCO), sometimes referred to as spin transition or spin equilibrium behavior, is a phenomenon that occurs in some metal complexes wherein the spin state of the complex changes due to external stimuli such as a variation of temperature, pressure, light irradiation or an influence of a magnetic field.With regard to a ligand field and ligand field theory, the change in spin state is a transition from a low spin (LS) ground state electron configuration to a high spin (HS) ground state electron configuration of the metal’s d atomic orbitals (AOs), or vice versa. The magnitude of the ligand field splitting along with the pairing energy of the complex determines whether it will have a LS or HS electron configuration. A LS state occurs because the ligand field splitting (Δ) is greater than the pairing energy of the complex (which is an unfavorable process).Figure 1 is a simplified illustration of the metal’s d orbital splitting in the presence of an octahedral ligand field. A large splitting between the t2g and eg AOs requires a substantial amount of energy for the electrons to overcome the energy gap (Δ) to comply with Hund’s Rule. Therefore, electrons will fill the lower energy t2g orbitals completely before populating the higher energy eg orbitals. Conversely, a HS state occurs with weaker ligand fields and smaller orbital splitting. In this case the energy required to populate the higher levels is substantially less than the pairing energy and the electrons fill the orbitals according to Hund’s Rule by populating the higher energy orbitals before pairing with electrons in the lower lying orbitals. An example of a metal ion that can exist in either a LS or HS state is Fe3+ in an octahedral ligand field. Depending on the ligands that are coordinated to this complex the Fe3+ can attain a LS or a HS state, as in Figure 1.Spin crossover refers to the transitions between high to low, or low to high, spin states. This phenomenon is commonly observed with some first row transition metal complexes with a d4 through d7 electron configuration in an octahedral ligand geometry. Spin transition curves are a common representation of SCO phenomenon with the most commonly observed types depicted in Figure 2 in which γHS (the high-spin molar fraction) is plotted vs. T. The figure shows a gradual spin transition (left), an abrupt transition with hysteresis (middle) and a two-step transition (right). For a transition to be considered gradual, it typically takes place over a large temperature range, even up to several hundred K, whereas for a transition to be considered abrupt, it should take place within 10 K or less.These curves indicate that a spin transition has occurred in a metal complex as temperature changed. The gradual transition curve is an indication that not all metal centers within the complex are undergoing the transition at the same temperature. The abrupt spin change with hysteresis indicates a strong cooperativity, or “communication”, between neighboring metal complexes. In the latter case, the material is bistable and can exist in the two different spin states with a different range of external stimuli (temperature in this case) for the two phenomena, namely LS → HS and HS → LS. The two-step transition is relatively rare but is observed, for example, with dinuclear SCO complexes for which the spin transition in one metal center renders the transition in the second metal center less favorable.There are several types of spin crossover that can occur in a complex; some of them are light induced excited state spin trapping (LIESST), ligand-driven light induced spin change (LD-LISC), and charge transfer induced spin transition (CTIST).