Bonding in dl0 transition metal complexes. I. Infrared, Raman, and N.Q.R. studies of some dihalocuprate(I) complexes

1973 ◽  
Vol 26 (1) ◽  
pp. 29 ◽  
Author(s):  
GA Bowmaker ◽  
LD Brockliss ◽  
R Whiting
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Raman Spectra ◽  
Transition Metal Complexes ◽  
Metal Atom ◽  
Organic Cations ◽  
Sufficient Information ◽  
Solid Complexes

The i.r. and Raman spectra of the dihalocuprate(1) ions CuX2- (X = Cl, Br) have been measured in solution, and in a number of crystalline compounds with large organic cations. The halogen and copper n.q.r. frequencies of the CuX2- ions in some of the solid complexes were also measured. In all cases, the ions were found to have linear, centrosymmetric structures. The various theories which have been proposed to describe the bonding in linear d10 transition metal complexes are discussed, and it is concluded that the scheme proposed by Orgel and Jorgensen, involving ds hybridization on the metal atom, best accounts for the n.q.r. results, although some uncertainty is introduced through the lack of sufficient information concerning the magnitude of the Sternheimer effect. An experiment which might differentiate between the ds and sp hybridization schemes in the case of linear AuI complexes is proposed.

Bonding in d10 transition metal complexes. II. Infrared, Raman, and N.Q.R. studies of some iodocuprate(I) complexes

1973 ◽  
Vol 26 (12) ◽  
pp. 2593 ◽  
Author(s):  
GA Bowmaker ◽  
LD Brockliss ◽  
CD Earp ◽  
R Whiting
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Raman Spectra ◽  
Transition Metal Complexes ◽  
Infrared And Raman Spectra ◽  
Bright Yellow ◽  
Solution Studies ◽  
Solid Complexes

The infrared and Raman spectra of a number of iodocuprate(I) complexes have been studied. None of the solid complexes studied appears to contain the discrete diiodocuprate(I), CuI2-, or triiododicuprate(I), Cu2I3-, ions which have previously been reported in solution studies, but bright yellow compounds which may contain the hexaiodotetracuprate(I) ion, Cu4I62-, have been prepared with methyltriphenylphosphonium and methyltriphenylarsonium cations. A structure based on a tetrahedron is proposed for the Cu4I62- ion, the copper atoms lying at the corners, and the iodine atoms bridging the copper atoms and lying along the edges of the tetrahedron. The evidence for this structure, and the information concerning the bonding in the ion obtainable from the vibrational and n.q.r. (63Cu, 65Cu, 127I) spectra are discussed.

Transition Metal Complexes of Ambidinourea and Related Ligands.

1969 ◽  
Vol 24 (12) ◽  
pp. 1514-1517 ◽  
Author(s):  
A. Syamal
Keyword(s):  
Magnetic Susceptibility ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Electronic Spectra ◽  
Strong Field ◽  
Absorption Bands ◽  
Effect Of Solvents ◽  
Infra Red ◽  
Solid Complexes

Copper (II), nickel (II), and palladium (II) complexes of amidinourea are reinvestigated in order to verify their structure. Electronic spectra and magnetic susceptibility measurements have been obtained on the solid complexes. Electronic spectral results indicate the donor strength of amidinourea is comparable to strong field ligands like biuret, biguanide, and I-amidino-O-alkylurea. Infra-red spectral results suggest that the carbonyl group of amidinourea is not involved in coordination and the donor atoms in amidinourea are amide nitrogens. The effect of solvents on the absorption bands is also discussed. The solution absorption spectra of bis (amidinourea) copper (II) chloride in different solvents indicate the following order of decreasing tetragonality:DMSO > methanol > ethyleneglycol > water.

scholarly journals Carbones and Carbon Atom as Ligands in Transition Metal Complexes

Molecules ◽  
2020 ◽  
Vol 25 (21) ◽  
pp. 4943 ◽  
Author(s):  
Lili Zhao ◽  
Chaoqun Chai ◽  
Wolfgang Petz ◽  
Gernot Frenking
Keyword(s):  
Carbon Atom ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Metal Atom ◽  
Lanthanide Complexes ◽  
Theoretical Studies ◽  
Complete Coverage ◽  
Review Reports ◽  
Experimental And Theoretical Studies

This review summarizes experimental and theoretical studies of transition metal complexes with two types of novel metal-carbon bonds. One type features complexes with carbones CL2 as ligands, where the carbon(0) atom has two electron lone pairs which engage in double (σ and π) donation to the metal atom [M]⇇CL2. The second part of this review reports complexes which have a neutral carbon atom C as ligand. Carbido complexes with naked carbon atoms may be considered as endpoint of the series [M]-CR3 → [M]-CR2 → [M]-CR → [M]-C. This review includes some work on uranium and cerium complexes, but it does not present a complete coverage of actinide and lanthanide complexes with carbone or carbide ligands.

Bonding in d10 transition metal complexes. IV. Infrared, Raman and N.Q.R. studies of some dihaloaurate(I) complexes

1976 ◽  
Vol 29 (7) ◽  
pp. 1407 ◽  
Author(s):  
GA Bowmaker ◽  
R Whiting
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Raman Spectra ◽  
Transition Metal Complexes ◽  
Vibrational Frequencies ◽  
Ionic Character ◽  
Infrared And Raman Spectra ◽  
Tetraalkylammonium Salts ◽  
Net Charge ◽  
Halide Complexes

The infrared and Raman spectra of bis(N,N-dibutyldithiocarbamato)gold(111) dichloroaurate(1), [(Bu2NCS2)2AU] AuCl2, and the corresponding bromo and iodo compounds have been measured, and the anion vibrational frequencies assigned. The results are compared with those for other MX2- ions (M = Cu, Ag; X = C1, Br, I). The chlorine n.q.r. frequencies for the above-named compound, and the corresponding tetraalkylammonium salts, [R4N] AuCl2 (R = Et, Bu), have also been measured. A Townes and Dailey analysis of the results indicates an ionic character of about 68% for the Au-Cl bond in the AuCl2- ion, and a net charge of about + 0.36e on the Au atom. These results are compared with those for some related metal halide complexes.

Mechanochemical changes on cyclometalated Ir(iii) acyclic carbene complexes – design and tuning of luminescent mechanochromic transition metal complexes

2020 ◽  
Vol 7 (3) ◽  
pp. 786-794 ◽  
Author(s):  
Jingqi Han ◽  
Kin-Man Tang ◽  
Shun-Cheung Cheng ◽  
Chi-On Ng ◽  
Yuen-Kiu Chun ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Carbene Complexes ◽  
New Class

A new class of luminescent cyclometalated Ir(iii) complexes with readily tunable mechanochromic properties derived from the mechanically induced trans-to-cis isomerization have been developed.

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