More Like this

1. Electron-Transfer Chain Catalysis of η ² -Arene, η ² -Alkene, and η ² -Ketone Exchange on Molybdenum

   https://doi.org/10.1021/acscatal.9b04191  

   Dakermanji, Steven J.; Smith, Jacob A.; Westendorff, Karl S.; Pert, Emmit K.; Chung, Andrew D.; Myers, Jeffery T.; Welch, Kevin D.; Dickie, Diane A.; Harman, W. Dean (October 2019, ACS Catalysis)
2. Unusual η ¹ ‐Coordinated Alkyne and Alkene Complexes

   https://doi.org/10.1002/chem.201903824  

   Li, Longfei; Dong, Mengxian; Zhu, Hua‐Jie; Peng, Bin; Xie, Yaoming; Schaefer, Henry F. (December 2019, Chemistry – A European Journal)
3. Crystal structure of the [(THF)Cs(μ-η ⁵ :η ⁵ -Cp′) ₃ Yb] _n oligomer

   https://doi.org/10.1107/S2056989020008051  

   Huh, Daniel N.; Ziller, Joseph W.; Evans, William J. (July 2020, Acta Crystallographica Section E Crystallographic Communications)

   null (Ed.)

   The green compound poly[(tetrahydrofuran)tris[μ-η 5 :η 5 -1-(trimethylsilyl)cyclopentadienyl]caesium(I)ytterbium(II)], [CsYb(C 8 H 13 Si) 3 (C 4 H 8 O)] n or [(THF)Cs(μ-η 5 :η 5 -Cp′) 3 Yb II ] n was synthesized by reduction of a red THF solution of (C 5 H 4 SiMe 3 ) 3 Yb III with excess Cs metal and identified by X-ray diffraction. The compound crystallizes as a two-dimensional array of hexagons with alternating Cs I and Yb II ions at the vertices and cyclopentadienyl groups bridging each edge. This, based off the six-electron cyclopentadienyl rings occupying three coordination positions, gives a formally nine-coordinate tris(cyclopentadienyl) coordination environment to Yb and the Cs is ten-coordinate due to the three cyclopentadienyl rings and a coordinated molecule of THF. The complex comprises layers of Cs 3 Yb 3 hexagons with THF ligands and Me 3 Si groups in between the layers. The Yb—C metrical parameters are consistent with a 4 f 14 Yb II electron configuration. 

   more » « less
4. The physics of the η–η′ system versus B0 → J/Ψη(η′) and Bs → J/Ψη(η′) decays

   https://doi.org/10.1142/S0217751X20501110  

   Andreichikov, M. A.; Eides, M. I.; Novikov, V. A.; Vysotsky, M. I. (July 2020, International Journal of Modern Physics A)

   An approach to the properties of the [Formula: see text] system developed to solve the famous [Formula: see text] problem is used to calculate the partial widths ratios to [Formula: see text] and [Formula: see text] in the [Formula: see text] and [Formula: see text] decays. We obtain the results in agreement with the experimental data. 

   more » « less
5. Crystal structures of phosphine-supported (η ⁵ -cyclopentadienyl)molybdenum(II) propionyl complexes

   https://doi.org/10.1107/S2056989021008008  

   Whited, Matthew T.; Ball, Margaret A.; Block, Alison; Brewster, Benjamin A.; Ferrer, LouLou; Jin-Lee, Helen J.; King, Colby J.; North, Jamie D.; Shelton, Inger L.; Wilson, David G. (September 2021, Acta Crystallographica Section E Crystallographic Communications)

   Three cyclopentadienylmolybdenum(II) propionyl complexes featuring triarylphosphine ligands with different para substituents, namely, dicarbonyl(η 5 -cyclopentadienyl)propionyl(triphenylphosphane-κ P )molybdenum(II), [Mo(C 5 H 5 )(C 3 H 5 O)(C 18 H 15 P)(CO) 2 ], ( 1 ), dicarbonyl(η 5 -cyclopentadienyl)propionyl[tris(4-fluorophenyl)phosphane-κ P ]molybdenum(II), [Mo(C 5 H 5 )(C 3 H 5 O)(C 18 H 12 F 3 P)(CO) 2 ], ( 2 ), and dicarbonyl(η 5 -cyclopentadienyl)propionyl[tris(4-methoxyphenyl)phosphane-κ P ]molybdenum(II) dichloromethane solvate, [Mo(C 5 H 5 )(C 3 H 5 O)(C 21 H 21 O 3 P)(CO) 2 ]·CH 2 Cl 2 , ( 3 ), have been prepared from the corresponding ethyl complexes via phosphine-induced migratory insertion. These complexes exhibit four-legged piano-stool geometries with molecular structures quite similar to each other and to related acetyl complexes. The extended structures of the three complexes differ somewhat, with the para substituent of the triarylphosphine of ( 2 ) (fluoro) or ( 3 ) (methoxy) engaging in non-classical C—H...F or C—H...O hydrogen-bonding interactions. The structure of ( 3 ) exhibits modest disorder in the position of one Cl atom of the dichloromethane solvent, which was modeled with two sites showing approximately equivalent occupancies [0.532 (15) and 0.478 (15)]. 

   more » « less