Synthesis, crystal structure and photophysical properties of N-heterocyclic carbene Pd(II), Pt(II) complexes and iodine adduct

Liu, Qingxiang; Song, Haibin; Xu, Fangfang; Liu, Qingshan; Zeng, Xianshun; Leng, Xue-Bin; Zhang, Zheng‐Zhi

doi:10.1016/s0277-5387(03)00268-7

Cited by 46 publications

(22 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Pd-C bond distances between the NHC ligand and the metal atom are 2.008(5) and 2.023(5) Å , comparable to those in other palladium(II)-NHC complexes [21][22][27][28][29]. The NHC ring (N1/C1/N2/C3/C4) is adapted to envelop conformation on C3 atom, and the dimethylphenyl rings bonded to this ring make dihedral angle of 15.5(3)°.…”

Section: Resultssupporting

confidence: 61%

Synthesis and structural characterization of Palladium(II) complex bearing N-Heterocyclic Carbene

et al. 2008

View full text Add to dashboard Cite

Trans-Bis[1,3-bis(2,4-dimethylphenylimidazolidin-2-ylidene)]dichloropalladium(II), 4, was prepared from 1,3-bis(2,4-dimetilphenyl)imidazoliniumchloride. The crystal and molecular structure of 4 have been determined by single crystal X-ray diffraction. The title compound, C 38 H 44 N 4 PdCl 2 , crystalizes in the monoclinic space group P 21/n with a = 13.8713(9) Å , b = 12.1365(6) Å , c = 21.5499(15) Å . The Pd atom has a slightly distorted square planar coordination geometry. The molecules of the title compound are linked by C-HÁÁÁCl weak hydrogen bonds into two-dimensional sheets parallel to the (001) plane. In addition, the title compound was characterized by elemental analyses and NMR spectroscopy.

show abstract

Section: Resultssupporting

confidence: 61%

Synthesis and structural characterization of Palladium(II) complex bearing N-Heterocyclic Carbene

et al. 2008

View full text Add to dashboard Cite

show abstract

“…These observations and conclusions are entirely in line with other reports of bis(carbene) complexes of Pd and Pt. 53, 63 The structural assignment for 6b-e is further supported by the solid-state structure of 6b.…”

Section: Methodsmentioning

confidence: 83%

“…The X-ray structures of numerous Pd bis(carbene) complexes have been reported in the literature, and both cis and trans complexes have been described. 23,34,53,[58][59][60][61][62][63] One might expect the trans isomers to be favored for steric reasons, and cis for electronic reasons due to the strong trans influence of the carbene ligands. The first structurally characterized Pd bis(carbene) was reported by Herrmann and co-workers in 1995, 61 and was prepared from Pd(OAc) 2 and an appropriate imidazolium salt.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of novel Pd(ii) complexes with chelating and non-chelating heterocyclic iminocarbene ligands

et al. 2005

View full text Add to dashboard Cite

The imidazolium salts [3-R1-1-{2-Ar-imino)-2-R2-ethyl}imidazolium] chloride (C-N; Ar = 2,6-iPr2C6H3; R1/R2 = Me/Me (a), Me/Ph (b), Ph/Me (c), 2,4,6-Me3C6H2 (d), 2,6-iPr2C6H3 (e)) react with Ag(2)O to give Ag(I) iminocarbene complexes (C-N)AgCl (4a-e) in which the iminocarbene ligand is bonded to Ag via the imidazoline-2-ylidene carbon atom. The solid-state structures of 4b and 4d were determined by X-ray crystallography and revealed the presence of monomeric (carbene)AgCl units with Z and E configurations at the imine C=N bonds, respectively. Carbene transfer to Pd occurs when compounds 4b-e are treated with (COD)PdCl2 to yield bis(carbene) complexes (C-N)2PdCl2 (6b-e) containing two kappa1-C bonded iminocarbene moieties. NMR spectroscopic data indicated a trans coordination geometry at Pd. This conclusion was supported by an X-ray structure determination of 6b which clearly demonstrated the non-chelating nature of the iminocarbene ligand system. EXSY 1H NMR spectroscopy suggests that the non-chelating structures undergo E/Z isomerization at the imine C[double bond, length as m-dash]N double bonds in solution. The preparative results contrast our earlier report that the reaction between 4a and (COD)PdCl2 results in a chelating kappa2-C,N bonded iminocarbene complex (C-N)PdCl2. The coordination mode and dynamic behavior of the iminocarbene ligand systems have been found to be dramatically affected by changes in the substitution pattern of the ligand system. Sterically unencumbered systems (a) favor the formation of kappa2-C,N chelate structures containing one iminocarbene moiety per metal upon coordination at Pd(II); these complexes were demonstrated to engage in reversible, solvent-mediated chelate ring-opening reactions. Sterically encumbered systems (b-e) form non-chelating kappa1-C iminocarbene Pd(II) complexes containing two iminocarbene ligands per metal. Transannular repulsions across the chelate ring are believed to be the origin of these structural differences.

show abstract

“…To this end various cyclometalated platinum complexes were described with β‐diketonate ligands, 8‐hydroxyquinolinate, carbenes, phosphinine coligand, and more recently with a phosphinoferrocene ligand . However cyclometalated platinum(II) complexes containing benzenedithiolate (bdt) as coligands are not very common, only two square planar anionic cyclometalated Pt II complexes [(C ^ N)Pt(S ^ S)][NBu 4 ] {(C ^ N = ppy = 2‐phenylpyridine; tbpiq = 4‐ tert ‐butylphenyl)isoquinoline; (S ^ S) = benzenedithiolate (bdt) } were described .…”

Section: Introductionmentioning

confidence: 99%

A Convenient Approach to Luminescent Cyclometalated Platinum(II) Complexes with Organometallic π‐Bonded Benzenedithiolate

et al. 2018

View full text Add to dashboard Cite

A family of neutral cyclometalated platinum(II) complexes [(C^N)Pt(η-S^S)] with π-bonded benzenedithiolate {(η-S^S) = Cp*Ru(C 6 H 4 S 2 )} and various cyclometalated ligands, (bzq) (4); dibenzo[f,h]quinoline (dbzq) (5)} were prepared and fully characterized. For comparison purposes the related bipyridine platinum(II) complex [(bpy)Pt(η-S^S)][OTf ] (6) was also prepared. The electrochemistry behavior of these complexes was investigated and shows the enhanced stability of these compounds toward oxidation [a] 3804 Scheme 1. Synthesis of cyclometalated platinum complexes 2-5.Scheme 2. Synthesis of the bipyridyl platinum complex 6.

show abstract

Synthesis, crystal structure and photophysical properties of N-heterocyclic carbene Pd(II), Pt(II) complexes and iodine adduct

Cited by 46 publications

References 34 publications

Synthesis and structural characterization of Palladium(II) complex bearing N-Heterocyclic Carbene

Synthesis and structural characterization of Palladium(II) complex bearing N-Heterocyclic Carbene

Synthesis and characterization of novel Pd(ii) complexes with chelating and non-chelating heterocyclic iminocarbene ligands

A Convenient Approach to Luminescent Cyclometalated Platinum(II) Complexes with Organometallic π‐Bonded Benzenedithiolate

Contact Info

Product

Resources

About