The crystal and molecular structure of phenothiazine-10-propionic acid

The crystal structure of phenothiazine-10-propionic acid, C₁₂H₈SNC₂H₄COOH, was determined from three-dimensional X-ray diffraction data collected with a manual diffractomer using MoKα (λ 0.71069 Å) radiation. The space group is P2₁/c with a = 7.888 (2)Å, b = 8.703 (2)Å, c = 19.700 (8)Å, β = 101.42 (1)°, Z = 4, D_meas = 1.35(2) g. cm^?3 and D_calc = 1.36 g. cm^?3 at 23°. The structure was determined by the direct method and refined with 500 observed reflections by full-matrix least squares to an R of 0.072. The molecule is folded along the S-N axis and the dihedral angle is 136.5°. The C-S-C angle is 98.5(7)° and the average C-S bond is 1.77(2)Å. The shortening of the C-S bond, the small value of the C-S-C angle and the folding of the molecule are typical of the phenothiazine class of compounds and are assumed to be due to sulfur d orbital participation in ring bonding.     

Molecular structure of [CpRu(PPh3)2(tht)]BF4, tht=tetrahydrothiophene

The title compound [CpRu(PPh₃)₂(tht)]BF₄,1, tht=tetrahydrothiophene, is obtained by the reaction of CpRu(PPh₃)₂Cl, tht and AgBF₄ in CH₂Cl₂ solution. Yellow crystals of [CpRu(PPh₃)₂(tht)]BF₄ were grown by the slow diffusion of pentane into a CH₂Cl₂ solution of1 and have been studied by X-ray crystallography: space group is P2₁/n,a=9.507(2),b=18.336(3),c=22.372(6) Å, =94.28(2)°,V=3889(1) ų,Z=4. The tht ligand binds to the Ru atom through the sulfur atom at a distance of 2.395(2) Å. The tht ring is in the puckered configuration.     

Structure of trans-aqua-bis(pyridine)dibenzoatocopper(II)

Crystals oftrans-aqua-bis(pyridine)dibenzoatocopper(II), Cu(NC₅H₅)₂(C₇H₅O₂)₂(H₂O), are monoclinic,P2₁/n, witha=5.9847(10),b=18.874(5),c=19.728(10)A,=92.97(4)°,Z=4, andV=2225.5(13)A³. The full-matrix least-squares refinement used 3030 reflections withI> 2.5(I) and converged toR=0.067. The benzoate ions bond as monodentate ligands in this five-coordinate complex. The copper ion is in a square pyrimidal environment with trans pyridine groups and benzoate ions in a slightly distorted square planar arrangement and a water ligand in the axial position. The Cu-O distance to the water molecule is significantly longer (2.273(4) Å) than the distances to the O atoms of the carboxyl groups (1.934(3) and 1.930(4)Å).     

Synthesis of Indoloquinolines: An Intramolecular Cyclization Leading to Advanced Perophoramidine-Relevant Intermediates

The bioactive natural product perophoramidine has proved a challenging synthetic target. An alternative route to its indolo[2,3-b]quinolone core structure involving a N-chlorosuccinimde-mediated intramolecular cyclization reaction is reported. Attempts to progress towards the natural product are also discussed with an unexpected deep-seated rearrangement of the core structure occurring during an attempted iodoetherification reaction. X-ray crystallographic analysis provides important analytical confirmation of assigned structures.     

New Theoretical Results of 2νββ Decay with the Operator Expansion Method

The half-lives for 2νββ decay for all the potential Pp-emitters with A≥70 are calculated by the operator expansion method. Compared with the directly measured half-lives of ⁷⁶Ge, ⁸²Se, ¹⁰⁰Mo and ²³⁸U the theoretical values are in excellent agreement with experimental ones.     

Neutrinoless Double Beta Decay-A New Formalism

A new method-the operator expansion method is used in neutrinoless double beta decay processes. Both the neutrino mass and mixing of right-handed leptonic current are included. It is shown that for nuclear neutrinoless double beta decay in 2n mechanism, there appear some new terms besides the terms given by the conventional treatment based on closure approximation. The ββ with a Majoron emission is also discussed.     

CAN THE PRINCIPLE OF MICROCAUSALITY BE REMOVED ARBITRARILY?

We discuss the problem of microcausality in a model of quantized field theory. Under the assumptions that the commutator of the "in" fields satisfies the requirement of translational invariance, we show that, in the case of self-conjugate scalar particles or particles with integer spins, one can deduce the law of microcausality.