Comprehensive coordination chemistry of alkali and alkaline earth cations with macrocyclic multidentates: latest position

Bajaj, Amritlal V.; Poonia, N. S.

doi:10.1016/0010-8545(88)80008-0

Cited by 125 publications

(53 citation statements)

References 746 publications

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“…The cyclic polyether 18C6 ligand that is thought to control 0022-328X/$ -see front matter Ó 2008 Elsevier B.V. All rights reserved. doi:10.1016/j.jorganchem.2008.04.046 molecular structure has been reported in alkaline-18C6 complexes [24][25][26][27]. The structure of the [alkaline-18C6] + fragment with the largest size metal ion is relatively rigid and exists as a halfsandwich encapsulate [24,27], with the small metal ion situated out of the crown ligand plane [27][28][29][30].…”

Section: Introductionmentioning

confidence: 98%

Structural and selectivity of 18-crown-6 ligand in lanthanide–picrate complexes

Saleh

Kusrini

Fun

et al. 2008

Journal of Organometallic Chemistry

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Section: Introductionmentioning

confidence: 98%

Structural and selectivity of 18-crown-6 ligand in lanthanide–picrate complexes

Saleh

Kusrini

Fun

et al. 2008

Journal of Organometallic Chemistry

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“…The stoichiometries of these systems have also been extensively discussed (19). A search of the Cambridge Structural Database (20) for crystal structure analyses of 15-crown-5 with one cyclohexano substituent containing alkali metal salts revealed no such structures.…”

Section: Introductionmentioning

confidence: 99%

Crown ether complexes exhibiting unusual 1:2 macrocycle salt ratios: X-ray crystal structures of cyclohexano-15-crown-5•2LiOPh, cyclohexano-15-crown-5•2NaOPh, and 15-crown-5•2NaOPh

Watson¹,

Fortier²,

Murchie³

et al. 1991

Can. J. Chem.

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. Can. J. Chem. 69,687 (1991). The crystal structures of three crown ether complexes (cyclohexano-15-crown-5.2LiOPh (I): Li207C26H36, Mr = 474.45, h(CuKa)filt. = 1.5418 A; cyclohexano-15-crown-5.2NaOPh (2): Na207C26H36, MI = 504.54, h(CuKa)filt. = 1.5418 A; and 15-crown-5.2NaOPh (3): Na207C22H30, MI = 452.46, h(CuKa)mono. = 1.5418 A) have been determined by X-ray diffraction at room temperature (T = 298 K). Complex 1 crystallizes in space group P2,/n with a = 15.032(5), b = 13.332(2), c = 13.533(3) A, P = 106.28(2)", V = 2603.2 A3, andZ = 4. Complex 2 crystallizes in space group P2Jn with a = 15.94(1), b = 12.194(7), c = 14.068(7) A, P = 102.84(5)", V = 2666.3 A3, andZ = 4. Complex 3 crystallizes in space group P2,/c with a = 12.451(3), b = 17.263(3), c = 12.659(6) A, P = 1 15.74(3)", V = 2450.8 A3, and Z = 4. The three structures were solved by direct methods and refined by full-matrix least-squares calculations to residuals, R, of 0.080,0.069, and 0.081 for complexes 1, 2, and 3, respectively. In each structure the macrocycle forms a 1:2 host-guest complex with the alkali metal. Each structure exhibits a dimer of the general form (MAC.2MOPh)2 where M = Li+ and Na+ for structures 1 and 2, respectively, and MAC = cyclohexano-15-crown-5, while M = Na+ and MAC = 15-crown-5 for structure 3. In each case the two metals of the monomeric unit have different crystallographic and chemical environments. In structures 1 and 3 one alkali metal is coordinated to all five oxygens of the macrocycle and to one of the phenoxide oxygens, while the other alkali metal is coordinated to only one oxygen of the macrocycle and to three phenoxide oxygens. In structure 2, one alkali metal is coordinated to only four of the five oxygens of the macrocycle and to two of the phenoxide oxygens, while the other alkali metal is coordinated to only one oxygen of the macrocycle and to three phenoxide oxygens (as in 1 and 3).Key words: crown ether, host-guest complexes, X-ray crystallography Dans chacune des structures, le macrocycle forme un complexe 1 : 2 hBte-invitC avec le mCtal alcalin. Chaque structure comporte un dimkre de la forme gCnCrale (MAC.2MOPh)2; pour les structures 1 et 2, MAC = cyclohexano-15-couronne-5 et M = Li+ et Na' respectivement alors que M = Na+ et MAC = 15-couronne-5 pour la structure 3. Dans chaque cas, les deux mCtaux de l'unitC monomkre sont dans des environnements cristallographiques et chimiques diffkrents. Dans les structures 1 et 3, un mCtal alcalin est coordinC aux cinq oxygknes du macrocycle et un oxygkne phenolique alors que l'autre metal alcalin est coordinC 2i un seul oxygkne macrocyclique et i trois oxygknes phenoliques. Dans la structure 2, un metal alcalin est coordinC 2 seulement quatre des cinq oxygknes du macrocycle et i deux oxygknes phCnoliques alors que l'autre metal alcalin est coordinC a seulement un oxygkne du macrocycle et i trois oxygknes phCnoliques.

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“…The type of interaction between cation and (neutral) crown is in general dependent on the size and charge density of the cation, the size and flexibility of the crown, the nucleophilicity of the counterion, and the nature of the solvent. For a recent, complete, review of this field, see Bajaj & Poonia (1988).…”

Section: Introductionmentioning

confidence: 99%

Dipotassium and sodium/potassium crystalline picrate complexes with the crown ether 6,7,9,10,12,13,20,21,23,24,26,27-dodecahydrodibenzo[b,n][1,4,7,10,13,16,19,22]octaoxacyclotetracosin (dibenzo-24-crown-8)

Gallagher¹,

Taylor²,

Ernst³

et al. 1991

Acta Crystallogr Sect B

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The crystal structures of the dipotassium and the mixed sodium/potassium picrate complexes with the crown ether dibenzo-24-crown-8 (DB24C8) were solved and found to be nearly identical. (I): NaKpicz(DB24C8), [NaK(C6H2N307)2(C24H3208)], Mr = 966.8, triclinic, P1, a = 8-164 (2), b = 9.960 (2), c= 13. structure. Na + is able to occupy an environment similar to that of K + under the conditions of these crystals, a situation not previously observed in the chemistry of crown ethers or macrocylic multidentates.

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Comprehensive coordination chemistry of alkali and alkaline earth cations with macrocyclic multidentates: latest position

Cited by 125 publications

References 746 publications

Structural and selectivity of 18-crown-6 ligand in lanthanide–picrate complexes

Structural and selectivity of 18-crown-6 ligand in lanthanide–picrate complexes

Crown ether complexes exhibiting unusual 1:2 macrocycle salt ratios: X-ray crystal structures of cyclohexano-15-crown-5•2LiOPh, cyclohexano-15-crown-5•2NaOPh, and 15-crown-5•2NaOPh

Dipotassium and sodium/potassium crystalline picrate complexes with the crown ether 6,7,9,10,12,13,20,21,23,24,26,27-dodecahydrodibenzo[b,n][1,4,7,10,13,16,19,22]octaoxacyclotetracosin (dibenzo-24-crown-8)

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