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1. Dibridged, Monobridged, Vinylidene-Like, and Linear Structures for the Alkaline Earth Dihydrides Be 2 H 2 , Mg 2 H 2 , Ca 2 H 2 , Sr 2 H 2 , and Ba 2 H 2 . Proposals for Observations

   https://doi.org/10.1021/acs.inorgchem.0c01651  

   Narendrapurapu, Beulah S. ; Bowman, Michael C. ; Xie, Yaoming ; Schaefer, Henry F. ; Tkachenko, Nikolay V. ; Boldyrev, Alexander I. ; Li, Guoliang ( August 2020 , Inorganic Chemistry)
2. The Prototypical Transition Metal Carbenes, (CO) 5 Cr=CH 2 , (CO) 4 Fe=CH 2 , (CO) 3 Ni=CH 2 , (CO) 5 Mo=CH 2 , (CO) 4 Ru=CH 2 , (CO) 3 Pd=CH 2 , (CO) 5 W=CH 2 , (CO) 4 Os=CH 2 , and (CO) 3 Pt=CH 2 : Challenge to Experiment

   https://doi.org/10.1021/acs.jpca.8b05394  

   Weidman, Jared D. ; Estep, Marissa L. ; Schaefer, Henry F. ( July 2018 , The Journal of Physical Chemistry A)
3. Crystal structures of three copper(II)–2,2′-bipyridine (bpy) compounds, [Cu(bpy) 2 (H 2 O)][SiF 6 ]·4H 2 O, [Cu(bpy) 2 (TaF 6 ) 2 ] and [Cu(bpy) 3 ][TaF 6 ] 2 and a related coordination polymer, [Cu(bpy)(H 2 O) 2 SnF 6 ] n

   https://doi.org/10.1107/S2056989021000633  

   Nisbet, Matthew L. ; Hiralal, Emily ; Poeppelmeier, Kenneth R. ( February 2021 , Acta Crystallographica Section E Crystallographic Communications)

   null (Ed.)

   We report the hydrothermal syntheses and crystal structures of aquabis(2,2′-bipyridine-κ 2 N , N ′)copper(II) hexafluoridosilicate tetrahydrate, [Cu(bpy) 2 (H 2 O)][SiF 6 ]·4H 2 O (bpy is 2,2′-bipyridine, C 10 H 8 N 2 ), (I), bis(2,2′-bipyridine-3κ 2 N , N ′)-di-μ-fluorido-1:3κ 2 F : F ;2:3κ 2 F : F -decafluorido-1κ 5 F ,2κ 5 F -ditantalum(V)copper(II), [Cu(bpy) 2 (TaF 6 ) 2 ], (II), tris(2,2′-bipyridine-κ 2 N , N ′)copper(II) bis[hexafluoridotantalate(V)], [Cu(bpy) 3 ][TaF 6 ] 2 , (III), and catena -poly[[diaqua(2,2′-bipyridine-κ 2 N , N ′)copper(II)]-μ-fluorido-tetrafluoridotin-μ-fluorido], [Cu(bpy)(H 2 O) 2 SnF 6 ] n , (IV). Compounds (I), (II) and (III) contain locally chiral copper coordination complexes with C 2 , D 2 , and D 3 symmetry, respectively. The extended structures of (I) and (IV) are consolidated by O—H...F and O—H...O hydrogen bonds. The structure of (III) was found to be a merohedral (racemic) twin. 

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4. Mechanistical study on the formation of hydroxyacetone (CH 3 COCH 2 OH), methyl acetate (CH 3 COOCH 3 ), and 3-hydroxypropanal (HCOCH 2 CH 2 OH) along with their enol tautomers (prop-1-ene-1,2-diol (CH 3 C(OH)CHOH), prop-2-ene-1,2-diol (CH 2 C(OH)CH 2 OH), 1-methoxyethen-1-ol (CH 3 OC(OH)CH 2 ) and prop-1-ene-1,3-diol (HOCH 2 CHCHOH)) in interstellar ice analogs

   https://doi.org/10.1039/d2cp03543j  

   Wang, Jia ; Marks, Joshua H. ; Turner, Andrew M. ; Nikolayev, Anatoliy A. ; Azyazov, Valeriy ; Mebel, Alexander M. ; Kaiser, Ralf I. ( January 2023 , Physical Chemistry Chemical Physics)

   We unravel, for the very first time, the formation pathways of hydroxyacetone (CH 3 COCH 2 OH), methyl acetate (CH 3 COOCH 3 ), and 3-hydroxypropanal (HCOCH 2 CH 2 OH), as well as their enol tautomers within mixed ices of methanol (CH 3 OH) and acetaldehyde (CH 3 CHO) analogous to interstellar ices in the ISM exposed to ionizing radiation at ultralow temperatures of 5 K. Exploiting photoionization reflectron time-of-flight mass spectrometry (PI-ReToF-MS) and isotopically labeled ices, the reaction products were selectively photoionized allowing for isomer discrimination during the temperature-programmed desorption phase. Based on the distinct mass-to-charge ratios and ionization energies of the identified species, we reveal the formation pathways of hydroxyacetone (CH 3 COCH 2 OH), methyl acetate (CH 3 COOCH 3 ), and 3-hydroxypropanal (HCOCH 2 CH 2 OH) via radical–radical recombination reactions and of their enol tautomers (prop-1-ene-1,2-diol (CH 3 C(OH)CHOH), prop-2-ene-1,2-diol (CH 2 C(OH)CH 2 OH), 1-methoxyethen-1-ol (CH 3 OC(OH)CH 2 ) and prop-1-ene-1,3-diol (HOCH 2 CHCHOH)) via keto-enol tautomerization. To the best of our knowledge, 1-methoxyethen-1-ol (CH 3 OC(OH)CH 2 ) and prop-1-ene-1,3-diol (HOCH 2 CHCHOH) are experimentally identified for the first time. Our findings help to constrain the formation mechanism of hydroxyacetone and methyl acetate detected within star-forming regions and suggest that the hitherto astronomically unobserved isomer 3-hydroxypropanal and its enol tautomers represent promising candidates for future astronomical searches. These enol tautomers may contribute to the molecular synthesis of biologically relevant molecules in deep space due to their nucleophilic character and high reactivity. 

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5. Quantum-vibrational-state-selected Integral Cross Sections and Product Branching Ratios for the Ion-molecule Reactions of N 2 + ( X 2 Σ g + ; v + = 0–2) + H 2 O and H 2 O + ( X 2 B 1 : v 1 + v 2 + v 3 + = 000 and 100) + N 2 in the Collision Energy Range of 0.04–10.00 eV

   https://doi.org/10.3847/1538-4357/aac9bf  

   Xu, Yuntao ; Xiong, Bo ; Chang, Yih Chung ; Ng, Cheuk-Yiu ( July 2018 , The Astrophysical Journal)