More Like this

1. Mechanisms and dynamics of the NH + 2 + H + and NH + + H + + H fragmentation channels upon single-photon double ionization of NH 3

   https://doi.org/10.1088/1361-6455/abc3aa  

   Larsen, Kirk A ; Rescigno, Thomas N ; Streeter, Zachary L ; Iskandar, Wael ; Heck, Saijoscha ; Gatton, Averell ; Champenois, Elio G ; Severt, Travis ; Strom, Richard ; Jochim, Bethany ; et al ( November 2020 , Journal of Physics B: Atomic, Molecular and Optical Physics)

   Abstract We present state-selective measurements on the N H 2 + + H + and NH + + H + + H dissociation channels following single-photon double ionization at 61.5 eV of neutral NH 3 , where the two photoelectrons and two cations are measured in coincidence using 3D momentum imaging. Three dication electronic states are identified to contribute to the N H 2 + + H + dissociation channel, where the excitation in one of the three states undergoes intersystem crossing prior to dissociation, producing a cold N H 2 + fragment. In contrast, the other two states directly dissociate, producing a ro-vibrationally excited N H 2 + fragment with roughly 1 eV of internal energy. The NH + + H + + H channel is fed by direct dissociation from three intermediate dication states, one of which is shared with the N H 2 + + H + channel. We find evidence of autoionization contributing to each of the double ionization channels. The distributions of the relative emission angle between the two photoelectrons, as well as the relative angle between the recoil axis of the molecular breakup and the polarization vector of the ionizing field, are also presented to provide insight on both the photoionization and photodissociation mechanisms for the different dication states. 

   more » « less
2. Synthesis and Crystallographic Characterization of a Reduced Bimetallic Yttrium ansa -Metallocene Hydride Complex, [K(crypt)][(μ-Cp An )Y(μ-H)] 2 (Cp An = Me 2 Si[C 5 H 3 (SiMe 3 )-3] 2 ), with a 3.4 Å Yttrium–Yttrium Distance

   https://doi.org/10.1021/jacs.3c01405  

   Wedal, Justin C. ; Anderson-Sanchez, Lauren M. ; Dumas, Megan T. ; Gould, Colin A. ; Beltrán-Leiva, María J. ; Celis-Barros, Cristian ; Páez-Hernández, Dayán ; Ziller, Joseph W. ; Long, Jeffrey R. ; Evans, William J. ( May 2023 , Journal of the American Chemical Society)
3. CH 3 –X Reductive Elimination Reactivity of Pt IV Me Complexes Supported by a Sulfonated CNN Pincer Ligand (X = OH, CF 3 CO 2 , PhNMe 2 + )

   https://doi.org/10.1021/acs.organomet.9b00702  

   Ruan, Jiaheng ; Wang, Daoyong ; Vedernikov, Andrei N. ( December 2019 , Organometallics)
4. Crystallographic characterization of rare-earth cyanotriphenylborate complexes and the cyanoborates [NCBPh 3 ] 1− , [NCBPh 2 Me] 1− , and [NCBPh 2 (μ-O)BPh 2 ] 1−

   https://doi.org/10.1107/S2056989021006861  

   Dumas, Megan T. ; White, Jessica R. ; Ziller, Joseph W. ; Evans, William J. ( August 2021 , Acta Crystallographica Section E Crystallographic Communications)

   The investigation of the coordination chemistry of rare-earth metal complexes with cyanide ligands led to the isolation and crystallographic characterization of the Ln III cyanotriphenylborate complexes dichlorido(cyanotriphenylborato-κ N )tetrakis(tetrahydrofuran-κ O )lanthanide(III), [ Ln Cl 2 (C 19 H 15 BN)(C 4 H 8 O) 4 ] [lanthanide ( Ln ) = dysprosium (Dy) and yttrium Y)] from reactions of LnCl 3 , KCN, and NaBPh 4 . Attempts to independently synthesize the tetraethylammonium salt of (NCBPh 3 ) − from BPh 3 and [NEt 4 ][CN] in THF yielded crystals of the phenyl-substituted cyclic borate, tetraethylazanium 2,2,4,6-tetraphenyl-1,3,5,2λ 4 ,4,6-trioxatriborinan-2-ide, C 8 H 20 N + ·C 24 H 20 B 3 O 3 − or [NEt 4 ][B 3 (μ-O) 3 (C 6 H 5 ) 4 ]. The mechanochemical reaction of BPh 3 and [NEt 4 ][CN] without solvent produced crystals of tetraethylazanium cyanodiphenyl-λ 4 -boranyl diphenylborinate, C 8 H 20 N + ·C 25 H 20 B 2 NO − or [NEt 4 ][NCBPh 2 (μ-O)BPh 2 ]. Reaction of BPh 3 and KCN in THF in the presence of 2.2.2-cryptand (crypt) led to a crystal of bis[(2.2.2-cryptand)potassium] 2,2,4,6-tetraphenyl-1,3,5,2λ 4 ,4,6-trioxatriborinan-2-ide cyanomethyldiphenylborate tetrahydrofuran disolvate, 2C 18 H 36 KN 2 O 6 + ·C 24 H 20 B 3 O 3 − ·C 14 H 13 BN − ·2C 4 H 8 O or [K(crypt)] 2 [B 3 (μ-O) 3 (C 6 H 5 ) 4 ][NCBPh 2 Me]·2THF. The [NCBPh 2 (μ-O)BPh 2 ] 1− and (NCBPh 2 Me) 1− anions have not been structurally characterized previously. The structure of 1-Y was refined as a two-component twin with occupancy factors 0.513 (1) and 0.487 (1). In 4 , one solvent molecule was disordered and included using multiple components with partial site-occupancy factors. 

   more » « less
5. Oxidation of Methylplatinum(II) Complexes K[(L)Pt II Me] with O 2 and C(sp 3 )-X (X = O and C) Reductive Elimination Reactivity of Methylplatinum(IV) Products ( L )Pt IV Me(OH): The Effect of Structure of Sulfonated CNN-Pincer Ligands L

   https://doi.org/10.1021/acs.organomet.2c00371  

   Ruan, Jiaheng ; Wang, Daoyong ; Kramer, Morgan J. ; Zavalij, Peter Y. ; Vedernikov, Andrei N. ( October 2022 , Organometallics)