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1. Synthesis, Purification, and Rotational Spectroscopy of 1-Cyanocyclobutene (C ₅ H ₅ N)

   https://doi.org/10.1021/acs.jpca.2c00384  

   Smith, Houston H.; Kougias, Samuel M.; Esselman, Brian J.; Woods, R. Claude; McMahon, Robert J. (March 2022, The Journal of Physical Chemistry A)
2. Synthesis and Reactivity of Functionalized Dimethylgermyl Complexes of the Formula (η ⁵ -C ₅ H ₅ )Re(NO)(PPh ₃ )(GeMe ₂ X); Equilibria Involving the Dimethylgermylene Complex [(η ⁵ -C ₅ H ₅ )Re(NO)(PPh ₃ )(=GeMe ₂ )]• TfO ⁻

   https://doi.org/10.1080/10426509408037445  

   Lee, Kenneth E.; Gladysz, J. A. (February 1994, Phosphorus, Sulfur, and Silicon and the Related Elements)
3. Reduced 2,2’‐Bipyridine Lanthanide Metallocenes Provide Access to Mono‐C ₅ Me ₅ and Polyazide Complexes

   https://doi.org/10.1002/ejic.202300732  

   Stennett, Cary_R; Ziller, Joseph_W; Evans, William_J (March 2024, European Journal of Inorganic Chemistry)

   Abstract Exploration of the reduction chemistry of the 2,2’‐bipyridine (bipy) lanthanide metallocene complexes Cp*₂LnCl(bipy) and Cp*₂Ln(bipy) (Cp* = C₅Me₅) resulted in the isolation of a series of complexes with unusual composition and structure including complexes with a single Cp* ligand, multiple azide ligands, and bipy ligands with close parallel orientations. These results not only reveal new structural types, but they also show the diverse chemistry displayed by this redox‐active platform. Treatment of Cp*₂NdCl(bipy) with excess KC₈resulted in the formation of the mono‐Cp* Nd(III) complex, [K(crypt)]₂[Cp*Nd(bipy)₂],1, as well as [K(crypt)][Cp*₂NdCl₂],2, and the previously reported [K(crypt)][Cp*₂Nd(bipy)]. A mono‐Cp* Lu(III) complex, Cp*Lu(bipy)₂,3, was also found in an attempt to make Cp*₂Lu(bipy) from LuCl₃, 2 equiv. of KCp*, bipy, and K/KI. Surprisingly, the (bipy)¹⁻ligands in neighboring molecules in the structure of3are oriented in a parallel fashion with intermolecular C⋅⋅⋅C distances of 3.289(4) Å, which are shorter than the sum of van der Waals radii of two carbon atoms, 3.4 Å. Another product with one Cp* ligand per lanthanide was isolated from the reaction of [K(crypt)][Cp*₂Eu(bipy)] with azobenzene, which afforded the dimeric Eu(II) complex, [K(crypt)]₂[Cp*Eu(THF)(PhNNPh)]₂,4. Attempts to make4from the reaction between Cp*₂Eu(THF)₂and a reduced azobenzene anion generated instead the mixed‐valent Eu(III)/Eu(II) complex, [K(crypt)][Cp*Eu(THF)(PhNNPh)]₂,5, which allows direct comparison with the bimetallic Eu(II) complex4. Mono‐Cp* complexes of Yb(III) are obtained from reactions of the Yb(II) complex, [K(crypt)][Cp*₂Yb(bipy)], with trimethylsilylazide, which afforded the tetra‐azido [K(crypt)]₂[Cp*Yb(N₃)₄],6, or the di‐azido complex [K(crypt)]₂[Cp*Yb(N₃)₂(bipy)],7 a, depending on the reaction stoichiometry. A mono‐Cp* Yb(III) complex is also isolated from reaction of [K(crypt)][Cp*₂Yb(bipy)] with elemental sulfur which forms the mixed polysulfido Yb(III) complex [K(crypt)]₂[Cp*Yb(S₄)(S₅)],8 a. In contrast to these reactions that form mono‐Cp* products, reduction of Cp*₂Yb(bipy) with 1 equiv. of KC₈in the presence of 18‐crown‐6 resulted in the complete loss of Cp* ligands and the formation of [K(18‐c‐6)(THF)][Yb(bipy)₄],9. The (bipy)¹⁻ligands of9are arranged in a parallel orientation, as observed in the structure of3, except in this case this interaction is intramolecular and involves pairs of ligands bound to the same Yb atom. Attempts to reduce further the Sm(II) (bipy)¹⁻complex, Cp*₂Sm(bipy) with 2 equiv. of KC₈in the presence of excess 18‐crown‐6 led to the isolation of a Sm(III) salt of (bipy)²⁻with an inverse sandwich Cp* counter‐cation and a co‐crystallized K(18‐c‐6)Cp* unit, [K₂(18‐c‐6)₂Cp*]₂[Cp*₂Sm(bipy)]₂ ⋅ [K(18‐c‐6)Cp*],10. 

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4. Comprehensive Re-examination of Intermetallic Charge Density for the Metal Carbonyl Dimers Mn ₂ (CO) ₁₀ and [(η ⁵ -C ₅ H ₅ )Fe(CO) ₂ ] ₂

   https://doi.org/10.1021/acs.inorgchem.4c05427  

   Yan, Connly; Radzhabov, Maxim R; Chang, Tieyan; Chen, Yu-Sheng; Mankad, Neal P (March 2025, Inorganic Chemistry)
5. Synthesis and structure of the rhenium phenylamido complex re(η ⁵ -C ₅ H ₅ )(NO)(PPh ₃ )(NHPh); an unprecedented pyramidal amido ligand

   https://doi.org/10.1039/C39910000712  

   Dewey, Michael A.; Arif, Atta M.; Gladysz, J. A. (January 1991, J. Chem. Soc., Chem. Commun.)