Isolation and complexation of the cis isomer of the pendant arm macrocycle 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine

Paul V. Bernhardt, Peter Comba, Trevor W. Hambley, Geoffrey A. Lawrance, K. Várnagy

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Abstract

The cis isomer of the pendant arm macrocyclic hexaamine 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine (L2) has been isolated for the first time. The ligand has been complexed with cadmium(II) and characterised structurally. The complex [CdL2][ClO4]2 crystallises in the monoclinic space group P21/n, a = 10.238(1), b = 16.445(2), c = 13.106(2) Å, β = 103.33(1)°, and Z = 4. The Cd-N bond lengths are not unusual by comparison with those exhibited by typical CdN6 2+ complexes, compared with the generally short M-N bond lengths that have been observed in sexidentate co-ordinated complexes of the trans isomer L1. Reaction of L1 with cadmium(II) does not yield a hexaamine complex, instead the pendant primary amines are not co-ordinated and the four secondary amines encircle the metal centre.

Original languageEnglish
Pages (from-to)355-359
Number of pages5
JournalJournal of the Chemical Society, Dalton Transactions
Issue number3
DOIs
Publication statusPublished - 1992

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Diamines
Bond length
Complexation
Cadmium
Isomers
Amines
Metals
Ligands
cyclam
perchlorate

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Isolation and complexation of the cis isomer of the pendant arm macrocycle 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine. / Bernhardt, Paul V.; Comba, Peter; Hambley, Trevor W.; Lawrance, Geoffrey A.; Várnagy, K.

In: Journal of the Chemical Society, Dalton Transactions, No. 3, 1992, p. 355-359.

Research output: Contribution to journalArticle

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abstract = "The cis isomer of the pendant arm macrocyclic hexaamine 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine (L2) has been isolated for the first time. The ligand has been complexed with cadmium(II) and characterised structurally. The complex [CdL2][ClO4]2 crystallises in the monoclinic space group P21/n, a = 10.238(1), b = 16.445(2), c = 13.106(2) {\AA}, β = 103.33(1)°, and Z = 4. The Cd-N bond lengths are not unusual by comparison with those exhibited by typical CdN6 2+ complexes, compared with the generally short M-N bond lengths that have been observed in sexidentate co-ordinated complexes of the trans isomer L1. Reaction of L1 with cadmium(II) does not yield a hexaamine complex, instead the pendant primary amines are not co-ordinated and the four secondary amines encircle the metal centre.",
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N2 - The cis isomer of the pendant arm macrocyclic hexaamine 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine (L2) has been isolated for the first time. The ligand has been complexed with cadmium(II) and characterised structurally. The complex [CdL2][ClO4]2 crystallises in the monoclinic space group P21/n, a = 10.238(1), b = 16.445(2), c = 13.106(2) Å, β = 103.33(1)°, and Z = 4. The Cd-N bond lengths are not unusual by comparison with those exhibited by typical CdN6 2+ complexes, compared with the generally short M-N bond lengths that have been observed in sexidentate co-ordinated complexes of the trans isomer L1. Reaction of L1 with cadmium(II) does not yield a hexaamine complex, instead the pendant primary amines are not co-ordinated and the four secondary amines encircle the metal centre.

AB - The cis isomer of the pendant arm macrocyclic hexaamine 6,13-dimethyl-1,4,8,11-tetraazacyclotetradecane-6,13-diamine (L2) has been isolated for the first time. The ligand has been complexed with cadmium(II) and characterised structurally. The complex [CdL2][ClO4]2 crystallises in the monoclinic space group P21/n, a = 10.238(1), b = 16.445(2), c = 13.106(2) Å, β = 103.33(1)°, and Z = 4. The Cd-N bond lengths are not unusual by comparison with those exhibited by typical CdN6 2+ complexes, compared with the generally short M-N bond lengths that have been observed in sexidentate co-ordinated complexes of the trans isomer L1. Reaction of L1 with cadmium(II) does not yield a hexaamine complex, instead the pendant primary amines are not co-ordinated and the four secondary amines encircle the metal centre.

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