ChemInform Abstract: AMBIDENTATE LIGAND WITH HIGH Π-ACCEPTOR CAPACITY: D6-METAL COMPLEXES OF 4,4′-BIPYRIMIDINE

1985 ◽  
Vol 16 (37) ◽  
Author(s):  
S. ERNST ◽  
W. KAIM
Keyword(s):  
Metal Complexes ◽  
Ambidentate Ligand ◽  
Acceptor Capacity

Metallkomplexe mit Tetrapyrrol-Liganden, XIX [1]. Synthese und elektrochemische Charakterisierung der Kohlenmonosulfid-Metalloctaethylporphyrine mit Eisen(II) oder Osmium(II) im Zentrum. Ein Beitrag zur "Bathochromie-Regel" / Metal Complexes with Tetrapyrrole Ligands, XIX [1]. Synthesis and Electrochemical Characterization of Thiocarbonyl Metallooctaethylporphyrins with Iron(II) or Osmium(II) in the Center. A Contribution to the "Rule of Bathochromism"

1978 ◽  
Vol 33 (12) ◽  
pp. 1371-1380 ◽  
Author(s):  
Johann W. Buchler ◽  
Wolfgang Kokisch ◽  
Paul D. Smith ◽  
Bernhard Tonn
Keyword(s):  
Metal Complexes ◽  
Linear Correlation ◽  
Optical Spectrum ◽  
Spectroscopic Characterization ◽  
Electrochemical Characterization ◽  
Redox Potentials ◽  
Acceptor Capacity ◽  
Α Band

The preparation and spectroscopic characterization of thiocarbonyl metalloporphyrins M(OEP)CS(L') (e.g. 2e: M = Fe, L' = Py, 1e: M = Os, L' = Py** are described. Especially noteworthy is the existence of a pentacoordinate, diamagnetic, air-stable heme Fe(OEP)CS (2f: M = Fe, no L′). A linear correlation of the α-band frequencies (expressed as ϋa) in the optical spectrum and the metal(II/III) redox potentials (E1/2) taken from cyclic voltam­metry experiments suggests (Abb. 3) that in complexes of the type M(OEP)LL' (1,2) λa is bathochromically shifted as the π-acceptor capacity of L increases (“Rule of Bathochromism”). The strong π-acceptor capacity of carbon monosulphide renders the attack of dioxygen to the thiocarbonyl heme unfavourable; O2 and CS seem to be comparable in their π-acceptor strength.

Metallkomplexe mit Tetrapyrrol-Liganden, XVIII* Osmiumkomplexe des meso-Tetra(p-tolyl)porphyrins / Metal Complexes with Tetrapyrrole Ligands, XVIII* Osmium Complexes of meso-Tetra(p-tolyl)porphyrin

1977 ◽  
Vol 32 (12) ◽  
pp. 1439-1448 ◽  
Author(s):  
Johann W. Buchler ◽  
Manfred Folz
Keyword(s):  
Metal Complexes ◽  
Spectroscopic Characterization ◽  
Porphyrin Ligand ◽  
Osmium Complexes ◽  
Acceptor Capacity

The preparation and spectroscopic characterization of osmium tetra(p-tolyl)porphyrin complexes, Os(TTP)LL′ (2c-21; L or L′ = CO, N2, EtOH, THF, Py, PPh3, P(OMe)3, methoxide or oxide) are described. 2c-21 are compared with the analogous octaethylporphyrin complexes, 1c-11. In 2c-21, the porphyrin ligand is a stronger π-acceptor than in 1c-11. The π-acceptor capacity of the porphyrin ligand renders the dinitrogenosmium(II) porphyrins 1j or 2j less stable than the dinitrogenpentammineosmium(II) cation.

Metal complexes of sulfur–nitrogen chelating agents. V. 2-N-Ethylaminocyclopentene-1-dithiocarboxylic acid complexes of Ni(II), Pd(II), Pt(II), Co(II), Co(III), and Cu(I)

1976 ◽  
Vol 54 (17) ◽  
pp. 2827-2831 ◽  
Author(s):  
K. Nag ◽  
D. S. Joardar
Keyword(s):  
Thermal Analysis ◽  
Metal Ions ◽  
Metal Complexes ◽  
Magnetic Moment ◽  
Nmr Spectra ◽  
Chelating Agents ◽  
Metal Chelates ◽  
Ambidentate Ligand

2-N-Ethylaminocyclopentene-1-dithiocarboxylic acid (EACDA) acts as an ambidentate ligand toward several metal ions. Bis-chelates have been obtained with Ni(II), Pd(II), Pt(II), and Co(II), and tris-chelate with Co(III). Cu(I) forms a 1:1 complex. The bonding sites involved in the metal chelates and their stereochemistry have been ascertained from electronic, infrared and nmr spectra, magnetic moment, and thermal analysis. In the Co(II) and Co(III) chelates bonding takes place from (S,S−) donor sites, whereas in the Ni(II), Pd(II), and Pt(II) chelates (N,S−) type bonding occurs. The Cu(I) complex appears to be polymeric in nature.

Preferential Behavior on Donating Atoms of an Ambidentate Ligand 2-Methylisothiazol-3(2H)-one in Its Metal Complexes

2013 ◽  
Vol 52 (23) ◽  
pp. 13375-13383 ◽  
Author(s):  
Masaru Kato ◽  
Kei Unoura ◽  
Toshiyuki Takayanagi ◽  
Yasuhisa Ikeda ◽  
Takashi Fujihara ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Ambidentate Ligand

Diverse polymeric metal complexes formed by the ambidentate ligand 1-(4′-pyridyl)pyridin-4-one

2003 ◽  
Vol 348 ◽  
pp. 187-193 ◽  
Author(s):  
David M.L Goodgame ◽  
David A Grachvogel ◽  
Andrew J.P White ◽  
David J Williams
Keyword(s):  
Metal Complexes ◽  
Polymeric Metal Complexes ◽  
Ambidentate Ligand

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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