Tricarbonyl(chlorodiphenylstannyl){η5-[2-(dimethylamino)ethyl]cyclopenta­dienyl}molybdenum

Reaction of the tricarbon­yl{η5-[2-(dimethyl­amino)eth­yl]cyclo­penta­dien­yl}molybdenum anion and dichlorido­diphenyl­stannane affords the title compound, [MoSn(C6H5)2Cl(C9H14N)(CO)3], which exhibits a four-legged piano-stool geometry with chlorido­diphenyl­stannyl ligands unperturbed by the pendant 2-(dimethyl­amino)ethyl groups. The Mo—Sn bond length [2.7584 (5) Å] and the distortion of the tetra­hedral tin coordination geometry are similar to those observed in related tin-substituted tricarbonyl­molybdenum and -tungsten complexes

Weakly nonlinear regression model with constraints I: nonlinear hypothesis

The problem considered is under which conditions in weakly nonlinear regression model with constraints I a weakly nonlinear hypothesis can be tested by linear methods. The aim of the paper is to find a region around the approximate value of the regression parameter with the following property. If we are certain that the actual value of the regression parameter is in this region, then the linear method of testing can be used without any significant deterioration of the inference

Aqueous Reduction of [Cp*2W2O5]: Characterization of the Triangular Clusters [Cp*3W3O4(OH)2]2+ and [Cp*3W3O6]+ – Comparison with Molybdenum

International audienceZinc reduction of Cp*2W2O5 in an acidified water–methanol medium affords the green 3‐electron trinuclear cluster [Cp*3W3O4(OH)2]2+, isolated and crystallographically characterized as the triflate salt, 1. Upon exposure to air, this complex is oxidized to a related 2‐electron cluster, [Cp*3W3O6]+, which was crystallized and characterized in three different salts, 2–4. The 3‐electron cluster exhibits a near‐tetragonal frozen‐glass EPR spectrum, and it shows evidence of coupling of the unpaired electron to only one of the three W atoms. The two‐electron cluster is diamagnetic. An electrospray ionization MSn study revealed a stepwise expulsion of neutral [Cp*WO2] units as the main fragmentation process. DFT calculations unveiled the intimate details of the electronic structures of these complexes and fully rationalized the structural and spectroscopic properties