The positron emitter Mn (t1/2 5 46.2 min, Iβ1 5 97%) is of potential interest in positron emission tomography (PET). With a view to optimizing its production route, excitation functions for deuteron induced nuclear reactions on isotopically enriched (,95%) Cr were determined radiochemically over the energy range of 3 to 13 MeV and for proton induced nuclear reactions on Cr in the range of 18 to...

Density functional calculations have been performed on the ground and excited states of MnCl(CO)(5) in order to explain the photochemistry of MX(CO)(5) complexes (M = Mn, Re; X = Cl, Br, I). As found earlier for Mn(2)(CO)(10) (Inorg. Chem. 1996, 35, 2886), the e(g)-type unoccupied 3d orbitals in the pseudooctahedral environment are located rather high in the virtual orbital spectrum, and the co...

We have studied the electronic structure of Mn impurities in GaAs by Mn 2p core-level photoemission spectroscopy. From cluster-model analysis assuming the neutral (Mn) or negatively ionized (Mn) ground state, electronic structure parameters have been obtained. In either case, the Mn d electron number is evaluated to be ;5 using the obtained parameters, meaning that the neutral Mn impurity, if i...

1 Department of Neurology (Behavioural Neurology), Mayo Clinic, Rochester, MN 55905, USA 2 Department of Neurology (Movement Disorders), Mayo Clinic, Rochester, MN 55905, USA 3 Department of Neurology (Speech Pathology), Mayo Clinic, Rochester, MN 55905, USA 4 Department of Psychiatry and Psychology (Neuropsychology), Mayo Clinic, Rochester, MN 55905, USA 5 Department of Information Technology,...

At physiological pH and concentrations of Mn(++) in excess of 5 x 10(-4)M, study of the Mn(++) ion movement into human red cells is complicated by physicochemical alterations of the ion itself. At concentrations below 5 x 10(x4)M, the rate of uptake bears a linear relationship to the Mn(++) concentration. The permeability constant for inward movement of Mn(++) is 2.87 +/- 0.13 (S.E.) x 10(-9) c...

The mononuclear Mn(CO)(5)X and binuclear Mn(2)(CO)(8)(μ-X)(2) manganese carbonyl halides have long been known for the halogens Cl, Br, and I. However, the corresponding manganese carbonyl fluorides (X = F) remain unknown. The structures and thermochemistry of such manganese carbonyl fluorides and their decarbonylation products have now been investigated using density functional theory. In all c...

The sterically encumbered pyrrolyl KPyr(tBu2) (1-K, Pyr(tBu2) = 2,5-(Me3C)2C4H2N) reacts with PCl3, (iPr)2PCl and Ph2PCl exclusively at the C3-position to yield a series of phosphine-substituted pyrroles HPyr(tBu2R) (R = PCl2 (2-H), (iPr)2P (4-H) and Ph2P (5-H)). Pyrrole 2-H can further be functionalized with MeLi (3 equiv.) to yield LiPyr(tBu2PMe2) (3-Li). The coordination chemistry of these p...

Abstract Catalytic decomposition is a promising way to eliminate ozone using manganese oxides. However, water-induced deactivation of the catalysts remains challenge for further application. In this work, series Ce-promoted MnO supported on ZSM-5 (Mn-xCe/ZSM-5) were developed decomposition, which exhibited superior catalytic performance. The characterized by multiple techniques. It indicated th...

Mixed-valent manganese phosphonate clusters [Mn(II)(8)Mn(III)(2)O(2)(O(3)PC(10)H(7))(4)(C(6)H(5)CO(2))(10)(py)(4)(H(2)O)(2)] (1) and [Mn(II)(4)Mn(III)(9)O(4)(OH)(2)(O(3)PC(10)H(7))(10)(C(6)H(5)CO(2))(5)(py)(8)(H(2)O)(6)] (2) are reported. Compound 1 is the first example of manganese phosphonate clusters prepared through a microwave-assisted technique. While compound 2 is obtained under ambient ...