quadruple bonds
Recently Published Documents


TOTAL DOCUMENTS

129
(FIVE YEARS 3)

H-INDEX

25
(FIVE YEARS 0)

Author(s):  
Elisabeth Aigeldinger ◽  
Lilliana Brandao ◽  
Troy Powell ◽  
Alaina C. Hartnett ◽  
Rui Sun ◽  
...  

The study of quadruple bonds between transition metals, in particular those of dimolybdenum, has revealed much about the two-electron bond. The solid-state structure of the quadruple-bonded dimolybdenum(II) complex tetrakis(μ-4-trifluoromethylbenzoato-κ2 O:O′)dimolybdenum(II) 0.762-pentane 0.238-tetrahydrofuran solvate, [Mo2(p-O2CC6H4CF3)4·2THF]·0.762C5H12·0.238C4H8O or [Mo2(C8H4F3O2)4(C4H8O)2]·0.762C5H12·0.238C4H8O is reported. The complex crystallizes within a triclinic cell and low symmetry (P\overline{1}) results from the intercalated pentane/THF solvent molecules. The paddlewheel structure at 100 K has inversion symmetry and comprises four bridging carboxylate ligands encases the Mo2(II,II) core that is characterized by two axially coordinated THF molecules and an Mo—Mo distance of 2.1098 (7) Å.


2018 ◽  
Vol 90 (4) ◽  
pp. 643-652
Author(s):  
Amr A. A. Attia ◽  
Alexandru Lupan ◽  
R. Bruce King

AbstractThe skeletal bonding topology as well as the Re=Re distances and Wiberg bond indices in the experimentally knownoblatoclosodirhenaboranes Cp*2Re2Bn−2Hn−2(Cp*=η5Me5C5,n=8–12) suggest formal Re=Re double bonds through the center of a flattened Re2Bn−2deltahedron. Removal of a boron vertex from theseoblatoclosostructures leads tooblatonidostructures such as Cp2W2B5H9and Cp2W2B6H10. Similar removal of two boron vertices from the Cp2Re2Bn−2Hn−2(n=8–12) structures generatesoblatoarachnostructures such as Cp2Re2B4H8and Cp2Re2B7H11. Higher energy Cp2Re2Bn−2Hn−2(Cp=η5-C5H5,n=8–12) structures exhibitclosodeltahedral structures similar to the deltahedral borane dianions BnHn2−. The rhenium atoms in these structures are located at adjacent vertices with ultrashort Re≣Re distances similar to the formal quadruple bond found in Re2Cl82−by X-ray crystallography. Such surface Re≣Re quadruple bonds are found in the lowest energy PnRe2Bn−2Hn−2structures (Pn=η5,η5-pentalene) in which the pentalene ligand forces the rhenium atoms to occupy adjacent deltahedral vertices. The low-energy structures of the tritungstaboranes Cp3W3(H)Bn−3Hn−3(n=5–12), related to the experimentally known Cp*3W3(H)B8H8, have central W3Bn−3deltahedra with imbedded bonded W3triangles. Similar structures are found for the isoelectronic trirhenaboranes Cp3Re3Bn−3Hn−3. The metal atoms are located at degree 6 and 7 vertices in regions of relatively low surface curvature whereas the boron atoms are located at degree 3–5 vertices in regions of relatively high surface curvature. The five lowest-energy structures for the 11-vertex tritungstaborane Cp3W3(H)B8H8all have the same central W3B8deltahedron and differ only by the location of the “extra” hydrogen atom. The isosceles W3triangles in these structures have two long ~3.0 Å W–W edges through the inside of the deltahedron with the third shorter W–W edge of ~2.7 to ~2.8 Å corresponding to a surface deltahedral edge.


2015 ◽  
Vol 71 (12) ◽  
pp. 1480-1484
Author(s):  
Carly R. Reed ◽  
William W. Brennessel

The title complexes, [Re2Br2(O2CC3H7)4], (1), and [Re2(O2CC3H7)4Cl2]·2CH3CN, (2), both exhibit paddlewheel structures with four carboxylate ligands bridging two ReIIIatoms. The Re—Re distances are 2.2325 (2) and 2.2299 (3) Å, indicating quadruple bonds between the ReIIIatoms in each complex. Both complexes contain an inversion center at the mid-point of the Re—Re bond. The Re—Br bond [2.6712 (3) Å] in (1) is 0.1656 (6) Å longer than the Re—Cl distance [2.5056 (5) Å] of (2). In (2), the N atom of each co-crystallized acetonitrile solvent molecule is nearly equidistant between and in close contact with two carboxylate C atoms.


2015 ◽  
Vol 54 (19) ◽  
pp. 9438-9446 ◽  
Author(s):  
Malcolm H. Chisholm ◽  
Terry L. Gustafson ◽  
William T. Kender ◽  
Thomas F. Spilker ◽  
Philip J. Young

2015 ◽  
Vol 137 (38) ◽  
pp. 12378-12387 ◽  
Author(s):  
Natalia Curado ◽  
Mario Carrasco ◽  
Eleuterio Álvarez ◽  
Celia Maya ◽  
Riccardo Peloso ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document