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1. Comparison of two Mn IV Mn IV -bis-μ-oxo complexes {[Mn IV (N 4 (6-Me-DPEN))] 2 (μ-O) 2 } 2+ and {[Mn IV (N 4 (6-Me-DPPN))] 2 (μ-O) 2 } 2+

   https://doi.org/10.1107/S2056989020004557  

   Coggins, Michael K. ; Downing, Alexandra N. ; Kaminsky, Werner ; Kovacs, Julie A. ( July 2020 , Acta Crystallographica Section E Crystallographic Communications)

   null (Ed.)

   The addition of tert -butyl hydroperoxide ( t BuOOH) to two structurally related Mn II complexes containing N,N -bis(6-methyl-2-pyridylmethyl)ethane-1,2-diamine (6-Me-DPEN) and N,N -bis(6-methyl-2-pyridylmethyl)propane-1,2-diamine (6-Me-DPPN) results in the formation of high-valent bis-oxo complexes, namely di-μ-oxido-bis{[ N , N -bis(6-methyl-2-pyridylmethyl)ethane-1,2-diamine]manganese(II)}( Mn — Mn ) bis(tetraphenylborate) dihydrate, [Mn(C 16 H 22 N 4 ) 2 O 2 ](C 24 H 20 B) 2 ·2H 2 O or {[Mn IV (N 4 (6-Me-DPEN))] 2 ( μ -O) 2 }(2BPh 4 )(2H 2 O) ( 1 ) and di-μ-oxido-bis{[ N , N -bis(6-methyl-2-pyridylmethyl)propane-1,3-diamine]manganese(II)}( Mn — Mn ) bis(tetraphenylborate) diethyl ether disolvate, [Mn(C 17 H 24 N 4 ) 2 O 2 ](C 24 H 20 B) 2 ·2C 4 H 10 O or {[Mn IV (N 4 (6-MeDPPN))] 2 ( μ -O) 2 }(2BPh 4 )(2Et 2 O) ( 2 ). Complexes 1 and 2 both contain the `diamond core' motif found previously in a number of iron, copper, and manganese high-valent bis-oxo compounds. The flexibility in the propyl linker in the ligand scaffold of 2 , as compared to that of the ethyl linker in 1 , results in more elongated Mn—N bonds, as one would expect. The Mn—Mn distances and Mn—O bond lengths support an Mn IV oxidation state assignment for the Mn ions in both 1 and 2 . The angles around the Mn centers are consistent with the local pseudo-octahedral geometry. 

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2. 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. 

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3. Engineering current density in excess of 200 A mm −2 at 20 T in CORC ® magnet cables containing RE-Ba 2 Cu 3 O 7−δ tapes with 38 μ m thick substrates

   https://doi.org/10.1088/0953-2048/28/12/124001  

   van der Laan, D. C. ; Goodrich, L. F. ; Noyes, P. ; Trociewitz, U. P. ; Godeke, A. ; Abraimov, D. ; Francis, A. ; Larbalestier, D. C. ( October 2015 , Superconductor Science and Technology)
4. Highly Reactive Co III,IV 2 (μ-O) 2 Diamond Core Complex That Cleaves C–H Bonds

   https://doi.org/10.1021/jacs.9b09531  

   Li, Yan ; Handunneththige, Suhashini ; Farquhar, Erik R. ; Guo, Yisong ; Talipov, Marat R. ; Li, Feifei ; Wang, Dong ( December 2019 , Journal of the American Chemical Society)
5. Opening the Co III,IV 2 (μ-O) 2 Diamond Core by Lewis Bases Leads to Enhanced C–H Bond Cleaving Reactivity

   https://doi.org/10.1021/jacs.0c07294  

   Li, Yan ; Handunneththige, Suhashini ; Xiong, Jin ; Guo, Yisong ; Talipov, Marat R. ; Wang, Dong ( December 2020 , Journal of the American Chemical Society)

   null (Ed.)