Chromium(II) amides: synthesis and structures

Edema, Jilles J. H.; Gambarotta, Sandro; Meetsma, Auke; Spek, Anthony L.; Smeets, Wilberth J. J.; Chiang, Michael Y.

doi:10.1039/dt9930000789

Cited by 69 publications

(78 citation statements)

References 26 publications

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“…Peng and co-workers (3,4) have shown that Cu and Ni compounds originally prepared by Brookes and Martin ( 5 ) are indeed 'windn1illn tetra(azaindo1ate)diinetal units. A similar binding mode has recently been reported for a dichromium system (6). Azaindole anions can be used to stabilize metal-metal bonds, as observed in quadruply-bonded diinolybdenum compounds (7,8).…”

Section: Introductionmentioning

confidence: 82%

Preparation and structure of chloro-copper(II) complexes of 7-azaindole

Poitras¹,

Beauchamp²

1992

Can. J. Chem.

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The light green trans-CuCl2(Haza)2 adduct precipitates immediately from mixtures of CuCl2•2H2O with excess 7-azaindole (Haza) in methanol. Upon standing in azaindole-rich solution, this solid is replaced by a deep green Cu2Cl4(Haza)6 compound, whose crystal structure (orthorbombic, Fdd2, a = 26.558, b = 23.750, c = 12.727 Ǻ, Z = 8, R = 0.068, Rw = 0.066) shows the presence of square-planar [Cu(Haza)4]2+ and trans-[CuCl2(Haza)2] units connected by bridging Cl− ions, making each Cu atom (4 + 2)-coordinated. Azaindole is bonded to the metal via the pyridine N7 site, whereas the five-membered ring retains its N1—H proton. The azaindole ligands are disordered over two orientations in the [CuCl2(Haza)2] unit. The square-planar Cu species and apical Cl− ions lie on a twofold axis and define along c an infinite chain based on the [Formula: see text] pattern. Equimolar mixtures of azaindole and CuCl2•2H2O yield a brown Cu4OCl6(Haza)4 compound. The crystal structure of its ethyl acetate solvate (monoclinic, P21/c, a = 11.661, b = 22.415, c = 15.077 Ǻ, β = 109.85°, Z = 4, R = 0.048, Rw = 0.054) shows the presence of a tetranuclear cluster consisting of a μ4-oxide ion surrounded by a tetrahedron of Cu(II) atoms bridged in pairs by chlorine atoms. The trigonal-bipyramidal coordination of each copper atom is completed by a monodentate N7-bonded azaindole molecule hydrogen bonded to bridging chlorines via N1—H. The influence of complexation on the infrared spectrum of azaindole is discussed.

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Section: Introductionmentioning

confidence: 82%

Preparation and structure of chloro-copper(II) complexes of 7-azaindole

Poitras¹,

Beauchamp²

1992

Can. J. Chem.

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“…Reaction of the solution of 1 with LiOPh under extremely dry conditions yields the expected blue solution from which single crystals of A were obtained and confirmed by measuring the single crystal structure at 150 K, 47 essentially confirming Edema et al 46 In the following, we studied the reaction outcomes using different ratios of CrCl 2 to LiOPh and water and/or LiOH.…”

Section: ■ Results and Discussionmentioning

confidence: 66%

“…22,23,37,40 This straightforward access to mixed metal aryl-and alkoxides inspired us to use this approach, replacing alkaline earth metal halides by chromium dihalides as starting compounds due to their better solubility and in spite of the sensitivity of such compounds to humidity. 45 Very similar to a compound described by us, [Ca(OPh) 8 Li 6 -(THF) 6 ], 42 the literature reports on a Cr(II) compound, namely, [Cr(OPh) 5 Li 3 (THF) 3 ] 2 , A (Figure 1), described by Edema et al 46 We were intrigued by this structure, expecting it to be easily oxidized yielding new Cr(III) species which are otherwise not available by direct synthesis from Cr(III) salts and reactions with phenolates. Indeed, the known species of Cr(III) clusters and aryloxide ligands are based on substituted phenolates, 46,48−53 while unsubstituted Cr(III) phenolates are unknown to the best of our knowledge.…”

Section: ■ Introductionmentioning

confidence: 68%

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Mixed metal multinuclear Cr(III) cage compounds and coordination polymers based on unsubstituted phenolate: design, synthesis, mechanism, and properties

Crochet¹,

Brog²,

Fromm³

2016

Acta Cryst Sect A

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“…T h e structure of a similar dinuclear chromium(I1) compound has been recently reported (6). O n the other hand, azaindole can act in a unidentate manner, for instance as axial ligand in dirhodium tetracarboxylates (7,8).…”

Section: Introductionmentioning

confidence: 99%

Complexation of 7-azaindole by the methylmercury(II) cation

Dufour¹,

Lebuis²,

Corbeil³

et al. 1992

Can. J. Chem.

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. Can. J. Chem. 70, 2914Chem. 70, (1992. Complexes of the types [CH,Hg(aza)], [CH,Hg(Haza)]X, and [(CH,Hg)z(aza)]X are obtained by reacting CH,HgOH and/or CH,HgX (X = NO,, C10,) with 7-azaindole (Haza). The weakly acidic NI-H proton on the pyrrole ring is displaced by the hydroxide, whereas the perchlorate and nitrate salts lead to CH3Hg+ coordination to the N7 lone pair on the pyridine ring. Detailed analysis of the infrared spectra of the complexes and their N-deuterated derivatives provides diagnostic regions for eventual prediction of the coordination mode in other systems. All compounds are characterized by means of 'H, "C, and ""Hg NMR spectra in DMSO solution and solid-state CP-MAS "C spectra. Comparison of the solution and solid-state "C spectra show that the species present in the solids remain undissociated in DMSO. Each type of complex can be identified from a characteristic pattern of large displacements of the ligand I3C signals. The ' H spectra are less informative because substitution of the Nl-H proton by CH,Hg' induces only minor shifts. Metal solvation appears to have a major influence on the "C and ' "~g chemical shifts of the CH,Hg' groups. dans Ics solides demeurent intactes dans le DMSO. Chaque type de complexe peut &tre identifie d'apres un ensemble carr~ctCristique de deplacements importants des signaux "C du ligand. Les spectres 'H sont moins revklateurs, parce que la substitution du proton Nl-H par CH,Hg' ne produit que de faibles dkplacements. La solvatation autour du ~nktal selnble exerccr une grande influence sur les deplacements chirniques "C et Hg des groupes CH,HgT.

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Chromium(II) amides: synthesis and structures

Cited by 69 publications

References 26 publications

Preparation and structure of chloro-copper(II) complexes of 7-azaindole

Preparation and structure of chloro-copper(II) complexes of 7-azaindole

Mixed metal multinuclear Cr(III) cage compounds and coordination polymers based on unsubstituted phenolate: design, synthesis, mechanism, and properties

Complexation of 7-azaindole by the methylmercury(II) cation

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