ChemInform Abstract: FURTHER STUDIES OF THE ELECTRONIC SPECTRA OF OCTACHLORODIRHENATE(2-) AND OCTABROMODIRHENATE(2-). ASSIGNMENT OF THE WEAK BANDS IN THE 600-350-NM REGION. STIMATION OF THE DISSOCIATION ENERGIES OF METAL-METAL QUADRUPLE BONDS

1977 ◽  
Vol 8 (29) ◽  
pp. no-no
Author(s):  
W. C. TROGLER ◽  
C. D. COWMAN ◽  
H. B. GRAY ◽  
F. A. COTTON
Keyword(s):  
Electronic Spectra ◽  
Dissociation Energies ◽  
Metal Metal ◽  
Quadruple Bonds

Characterizations of Novel Binuclear Transition Metal Polynitrogen Compounds: M2(N5)4 (M=Co, Rh and Ir)

2014 ◽  
Vol 924 ◽  
pp. 233-252 ◽  
Author(s):  
Li Hong Tang ◽  
Hui Bin Guo ◽  
Qian Shu Li ◽  
Jin Hui Peng ◽  
Jun Jie Gu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Nbo Analysis ◽  
High Order ◽  
Multiple Bonds ◽  
Dissociation Energies ◽  
Nucleus Independent Chemical Shift ◽  
Metal Atoms ◽  
Metal Metal ◽  
Natural Bonding Orbital ◽  
Polynitrogen Compounds

Theoretical studies on a series of binuclear transition metal pentazolides M2(N5)4(M=Co, Rh and Ir) predict Paddlewheel-type structures with very short metal-metal distances suggesting high-order metal-metal multiple bonds. Natural Bonding Orbital (NBO) analysis have indicated that the bonding between the metal atom and the five-membered ring is predominantly ionic for each M2(N5)4species, and a high-order metal-metal multiple bonding exists between the two metal atoms, in addition, the presence of the delocalized π orbital plays an important role in the stabilization of this metal-polynitrogen species. Nucleus independent chemical shift (NICS) values confirm that the planar N5exhibits aromaticity in these M2(N5)4species. The values of NICS(0.0), NICS(0.5) and NICS(1.0) for Co2(N5)4are larger than those of the other two M2(N5)4species (M=Rh and Ir), with the order of Co2(N5)4>Rh2(N5)4>Ir2(N5)4. The dissociation energies into Mononuclear Fragments for M2(N5)4(M=Co, Rh and Ir) are predicted to be 82.9 (85.7), 139.9 (113.2), and 155.1 (149.7) kcal/mol, respectively. However, the dissociation energies for the loss of one pentazolato group from the M2(N5)4analysis have indicated that the Co2(N5)4is relatively higher at ~40 kcal/mol. Thermochemistry suggests Co2(N5)4to be a viable species.

A Journey of Metal-metal Bonding beyond Cotton's Quadruple Bonds

2013 ◽  
Vol 61 (1) ◽  
pp. 9-26 ◽  
Author(s):  
Shao-An Hua ◽  
Yi-Chou Tsai ◽  
Shie-Ming Peng
Keyword(s):  
Metal Bonding ◽  
Metal Metal ◽  
Quadruple Bonds

ChemInform Abstract: Activated Molybdenum-Molybdenum Quadruple Bonds. Part 2. First Example of Alkyne Additions to Metal-Metal Quadruple Bonds.

ChemInform ◽  
2010 ◽  
Vol 22 (20) ◽  
pp. no-no
Author(s):  
M. C. KERBY ◽  
B. W. EICHHORN ◽  
L. DOVIKEN ◽  
K. P. C. VOLLHARDT
Keyword(s):  
Metal Metal ◽  
Quadruple Bonds
Sign in / Sign up

Export Citation Format

Share Document