1996
DOI: 10.1021/ic951634n
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Dinuclear Oxomolybdenum(V) Complexes Showing Strong Interactions across Diphenol Bridging Ligands:  Syntheses, Structures, Electrochemical Properties, and EPR Spectroscopic Properties

Abstract: We have prepared a series of dinuclear complexes [{MoV(O)(Tp*)Cl}(μ-OO)], where “OO” represents one of the series of diphenolate bridging ligands [1,4-O(C6H4) n O]2- (n = 1−4; complexes 1−4, respectively), [O(C6H3-2-Me)2O]2- (complex 5), or [1,3-OC6H4O]2- (complex 6) [Tp* = tris(3,5-dimethylpyrazolyl)hydroborate]. The complexes therefore contain two paramagnetic (d1), redox-active metal centers. For complexes 1−4 the metal−metal separation increases due to the increasing number of phenyl spacers in the bridge.… Show more

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Cited by 53 publications
(79 citation statements)
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“…24 Oxo-Mo(V) Complexes. The EPR spectrum of mononuclear [Mo V (O)Tp*Cl(OPh)] likewise consists of a superimposed singlet and sextet with a hyperfine coupling A Mo of 50 G. 8 The dinuclear complexes [{Mo V (O)Tp*Cl} 2 (µ-OO)] give, with the longer bridging ligands, typical exchange-coupled spectra with overlapping 1 + 6 + 11 multiplets and a halved hyperfine separation of 25 G. 20 These dinuclear complexes therefore have EPR spectra like those of the dinuclear nitrosyl-Mo(I) complexes, showing the presence of a magnetic exchange interaction between the unpaired electrons with |J| . A Mo .…”
Section: Epr Spectra Of the Isovalent Polyradicalsmentioning
confidence: 99%
“…24 Oxo-Mo(V) Complexes. The EPR spectrum of mononuclear [Mo V (O)Tp*Cl(OPh)] likewise consists of a superimposed singlet and sextet with a hyperfine coupling A Mo of 50 G. 8 The dinuclear complexes [{Mo V (O)Tp*Cl} 2 (µ-OO)] give, with the longer bridging ligands, typical exchange-coupled spectra with overlapping 1 + 6 + 11 multiplets and a halved hyperfine separation of 25 G. 20 These dinuclear complexes therefore have EPR spectra like those of the dinuclear nitrosyl-Mo(I) complexes, showing the presence of a magnetic exchange interaction between the unpaired electrons with |J| . A Mo .…”
Section: Epr Spectra Of the Isovalent Polyradicalsmentioning
confidence: 99%
“…The first crystallographic report on a transition metal hydroquinone appeared in 1982 (Heistand, et al, 1982 (Evans, et al, 1998), or Fe III (5,10,15,20-tetraphenylporphyrinato) + (45) (Rheingold & Miller, 2003), or Ti IV Cl(CP * ) 2 + (38) (Kunzel, et al, 1996), or Ti III (CP * ) 2 (37) (Horacek, et al, 2010) (Stobie, et al, 2003) or Mo V OCl[hydrogen tris(3,5-dimethylpyrazolyl)borate] + (41) (Ung, et al, 1996). The last two moieties present additional interest because they form trinuclear complexes with two hydroquinones bridging three of these groups in an open structure (46) (Ung, et al, 1999) or three hydroquinones bridging three groups in a close triangular structure (42) (35) (McQuillan, et al, 1998;McQuillan, et al, 1996) (Figure 5).…”
Section: Simple Hydroquinonesmentioning
confidence: 99%
“…Especially Kharash-and Suzuki-type couplings using Grignard reagents or arylboronic acids or esters have been used very successfully in this context . Although most of the molecules prepared in this way carry long alkyl or alkoxy groups that ensure solubility in common organic solvents a few examples of only 1,4" '-disubstituted p-quaterphenylenes could also be prepared [118,119,137,[147][148][149][150][151]. Thus, a similar approach for the author´s purposes was followed using Suzuki crosscoupling reactions as the key steps in the synthesis of our target compounds.…”
Section: Fig 12mentioning
confidence: 99%
“…1,4´´´-Dimethoxy-4,1´:4´,1´´:4´´,1´´´-quaterphenylene (MOP4) [112,[195][196][197] Under an argon atmosphere 1.1 g (3.4 mmol) of 4,4´-dibromobiphenyl, 1.14 g (7. The grey precipitate was filtered off, washed with tetrahydrofurane and water.…”
Section: Symmetrically Functionalised Para-quaterphenylenesmentioning
confidence: 99%