1997
DOI: 10.1021/ic970864u
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Abstract: A series of dinuclear M(III) (M = Fe or Ga) catecholate complexes has been prepared using bisbidentate catecholate ligands (L). The products contain discrete, dinuclear M2(L)3 6- anions featuring pseudo-octahedral coordination centers. The helical nature of the dinuclear complexes has been established by CD spectroscopy and X-ray crystallography. The salt (N(CH3)4)6Ga2(L 3 )3 (L 3 = N,N‘-bis(2,3-dihydroxy-4-carbamoylbenzoyl)-1,4-phenylenediamine) has been characterized by X-r… Show more

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Cited by 120 publications
(91 citation statements)
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“…The helicate, with the same configuration at both metal-complex units, is the favored diastereoisomer due to the rigidity of the linear conjugated spacer. [28,52,61,67,68] Formation and structure of M 4 [(3) 3 Ti 2 ] (M= Li, Na, K): Titanium(iv) complexes of ligand 3 cannot be prepared as was described for the corresponding complexes of ligand 2 due to the low solubility of 3. . [69] X-ray quality crystals of Na 4 [(3) 3 Ti 2 ]¥13 DMF were obtained by slow diffusion of diethyl ether into a solution of the sodium salt in DMF.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The helicate, with the same configuration at both metal-complex units, is the favored diastereoisomer due to the rigidity of the linear conjugated spacer. [28,52,61,67,68] Formation and structure of M 4 [(3) 3 Ti 2 ] (M= Li, Na, K): Titanium(iv) complexes of ligand 3 cannot be prepared as was described for the corresponding complexes of ligand 2 due to the low solubility of 3. . [69] X-ray quality crystals of Na 4 [(3) 3 Ti 2 ]¥13 DMF were obtained by slow diffusion of diethyl ether into a solution of the sodium salt in DMF.…”
Section: Resultsmentioning
confidence: 99%
“…[15,48,50] Chiral units in the ligand spacer can control the stereochemistry at the metal complex units, [51] or steric constraints enforce one of the two possible diastereomeric forms of coordination compounds. [28,52] As a systematic entry for the stereospecific preparation of helicates or meso-helicates, we introduced the ™even±odd principle∫ [53] in this field of chemistry: We prepared alkylbridged dicatechol, [54] di-8-hydroxyquinoline, [55] or dibipyridine [43] ligands with alkyl spacers of different length (e.g. 1 a-H 4 , 1 b-H 4 ), and owing to the preferred zigzag conformation of the alkyl chain, the diastereoselectivity of the complex formation can be controlled.…”
Section: Introductionmentioning
confidence: 99%
“…The configuration of each metal center is thus dependent on the configurations of its neighbors. This phenomenon has been studied in triple-stranded helicates 39,40 and in tetrahedral capsules. 4145 Depending on the configuration of each metal center a tetrahedral ensemble ([M 4 (L) 6 ] or [M 4 (L) 4 ]) can adopt either homochiral T (ªªªª/¦¦¦¦), heterochiral C 3 (¦¦¦ª/ ªªª¦), or achiral S 4 (ªª¦¦) overall symmetry, as shown in Figure 2 for the [M 4 (L) 6 ] case.…”
Section: Stereochemistry Of Tetrahedral Metalorganic Capsulesmentioning
confidence: 99%
“…7,8 Recently, considerable interest has been focused on combined catalytic systems in general chemical processes, and extensive investigations have also been drawn into their use in ethylene reactivity. 9 Respect to the preference toward iron and cobalt catalysts for use in ethylene reaction, the most common model in building the combined catalytic systems is by coupling multi-bis(imino)-pyridyl or -(imino)pyridyl metal (iron or cobalt) moieties into a molecule, 8,10,11 based on expectations that their catalytic behavior may significantly differ from those simple derivatives.…”
Section: Introductionmentioning
confidence: 99%