syn-bis-diazene als matrices für den aufbau flächiger oligometall-aggregate

Fischer, Gerhard W.; Sedelmeier, Gottfried; Prinzbach, Horst; Knoll, Konrad; Wilharm, P.; Hüttner, Gottfried; Jibril, Ibrahim

doi:10.1016/0022-328x(85)80432-0

Cited by 8 publications

(2 citation statements)

References 10 publications

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“…28 The unique pentanuclear neutral iron derivative structurally characterized is "stabilized" by a large syn-bis-diazene ligand. 29 These structures are not easily comparable with those reported in this work; therefore comparisons of bonding distances and angles will not be attempted.…”

Section: Structures Of Complexesmentioning

confidence: 82%

Metal fragment condensation and carbon–carbon bond cleavage in reactions of [Fe3(CO)12] with internal propargyl alcohols. Structures of the “bow tie” acetylide complexes [Fe5(CO)14(C2R)2] (R =Me or Et)

Brait

Gervasio

Marabello

et al. 2000

J. Chem. Soc., Dalton Trans.

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The propargyl alcohols RC 2 C(H)(OH)RЈ (R = H, RЈ = Et; R = Me, RЈ = Et; R = Et, RЈ = Me; R = Ph, RЈ = Pr i ) reacted with [Fe 3 (CO) 12 ] in hydrocarbon solvents to give, as the final products, binuclear "ferrole" derivativesalcohol] in several isomers. Small amounts of tri-and penta-nuclear complexes were also obtained. In particular, when R = H or Ph trinuclear complexes [Fe 3 (CO) 9 -(µ-CO)L] 1 with a "parallel" alkyne ligand could be isolated and characterized by IR and NMR spectroscopies and mass spectrometry. When R = Me or Et the "bow tie" acetylide complexes [Fe 5 (CO) 14 (C 2 R) 2 ] (R = Me 2a or Et 2b) were isolated; their structures were determined by X-ray diffraction. The complexes 2a and 2b are formed by two Fe 3 triangles sharing a common vertex: each triangle is co-ordinated in a perpendicular fashion by an acetylide fragment and the carbon of one of the acetylide ligands is bound to four iron atoms. Complexes 2 are new examples of an uncommon type of cluster framework; they are presumably formed upon condensation of metal fragments generated by triiron dodecacarbonyl and upon cleavage of a carbon-carbon bond α to the alkyne triple bond. Possible formation mechanisms are discussed.

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Section: Structures Of Complexesmentioning

confidence: 82%

Metal fragment condensation and carbon–carbon bond cleavage in reactions of [Fe3(CO)12] with internal propargyl alcohols. Structures of the “bow tie” acetylide complexes [Fe5(CO)14(C2R)2] (R =Me or Et)

Brait

Gervasio

Marabello

et al. 2000

J. Chem. Soc., Dalton Trans.

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“…The topological analysis of compound 8 gives an NDk-m symbol 2,3,4M5-1 and this is the first example ever seen in Ni chemistry. Interestingly, the latter topology can be found in compounds containing solely Mn, 72,73 Fe, 74 Co [75][76][77][78] and Zn. 79…”

Section: Solution Studiesmentioning

confidence: 98%

Polynuclear ampyrone based 3d coordination clusters

et al. 2018

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Proximate,syn-Periplanar Bisdiazene Skeletons: Syntheses, Structures, Homoconjugate Reactivity and Photochemistry

Exner¹,

Fischer

Bahr

et al. 2000

Eur. J. Org. Chem.

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Rigid NN/NN (diazene/diazene) systems (F) consisting of more or less alkylated DBH and DBO chromophoric units (1, 2, X‐ray structures), with very short π,π distances [d = 2.849 (1a, av.), 2.822 Å (2)] and almost perfect syn‐periplanar π,π alignments [ω = 168.6 (1a), 174.2° (2)] as well as the more flexible, less “proximate” metathesis isomers (3a,c, 27a,c, d >4.6 Å, ω = 90‐100°) have been synthesized. Homoconjugate π,π interaction (in 1, 2, not in 3, 27) is deduced from UV spectroscopic measurements [π → π* maxima at 239 (234) nm (sh, 260)], while PE analyses furnished only small interaction parameters (1a: <0.3 eV). The potential of the novel syn‐periplanar NN/NN motif in 1 and 2 for the synthesis of somewhat exotic polyheterocycles has been explored by calculation (B3LYP) as well as experimentally: i.a. kinetically stabilized, all‐cis‐peralkylated tetrazolidines (38, 44) and perhydro‐1,2,4,5‐tetrazines (41, 47) have become accessible (i.a. via novel azomethine/diazene and azomethine/azomethine cycloadditions). In 1a with its unreactive DBO chromophoric subunits, in the “buttressed” derivatives 1b‐d, as well as in the DBH/DBO combination 2, and likewise in more ‘distant’ 27 (differently from the analogous CC/CC and NN/CC systems), irrespective of the excitation conditions employed (light of λ ≥≥ 280, 254 nm, low temperature matrix irradiation, acetone sensitization) no [2+2]photocycloaddition was observed. Instead exclusively N2‐elimination took place. It is argued that unproductive NN/NN photocycloaddition would have become observable through metathesis isomerization of the respective tetrazetidines.

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syn-bis-diazene als matrices für den aufbau flächiger oligometall-aggregate

Cited by 8 publications

References 10 publications

Metal fragment condensation and carbon–carbon bond cleavage in reactions of [Fe3(CO)12] with internal propargyl alcohols. Structures of the “bow tie” acetylide complexes [Fe5(CO)14(C2R)2] (R =Me or Et)

Metal fragment condensation and carbon–carbon bond cleavage in reactions of [Fe3(CO)12] with internal propargyl alcohols. Structures of the “bow tie” acetylide complexes [Fe5(CO)14(C2R)2] (R =Me or Et)

Polynuclear ampyrone based 3d coordination clusters

Proximate,syn-Periplanar Bisdiazene Skeletons: Syntheses, Structures, Homoconjugate Reactivity and Photochemistry

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