The Use of Tetradentate (N2O2) Ligands To Form Monomeric, Trimetallic Aluminum Complexes

David A. Atwood, Jolin A. Jegier, Kyli J. Martin, Drew Rutherford

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Members of the SalanH4 class of tetradentate (—N2O2) ligand, N,N'-bis(o-hydroxybenzyl)-1,2-diaminoethane (SaleanH4), N,N'-bis(o-hydroxybenzyl)-1,3-diaminopropane (SalpanH4), N, N'-bis(o-hydroxybenzyl)-1,2-diaminobenzene (SalophanH4), and N,N'-bis(o-hydroxybenzyl)-1,2-diamino-4,5-dimethylbenzene (SalomphanH4), demonstrate a wide range of chemistry with AlMe3. For instance, SalpanH4will react with 1 and 2 equiv of AlMe3to produce the complexes SalpanH2(AlMe) (1) and [SalpanAl(AlMe2)]2 (2), respectively. When 3 equiv of AlMe3is added to the appropriate ligand, the novel trimetallic derivatives Salean(AlMe)-(AlMe2)2 (3), Salpan(AlMe)(AlMe2)2 (4), Salophan(AlMe)(AlMe2)2 (5), and Salomphan(AlMe)-(AlMe2)2 (6) result. A general feature of 3–6 is the presence of a rigid solution-state geometry as evidenced by the 1H NMR. A crystallographic study of 3 has shown that the molecules are comprised of a central AlMe group coordinated in a planar array to the nitrogens and oxygens of the ligand. The two AlMe2groups each bridge an oxygen and nitrogen atom. The overall morphology of 4 and 5 is similar to that shown for 3. However, structural characterization of 4 and 5 indicates that the AlMe2groups are inequivalent, with one bridging the two oxygens and the other bridging the two nitrogens. Crystal data for 3: C21H31Al3N2O2, space group P1̅ (No. 2) with a = 7.946(3) Å, b = 9.662(3) Å, c = 15.804(6) Å, α = 89.192(5)°, β = 84.434(6)°, γ = 79.926(4)°, V = 1189.0(7) Å3 and Z = 2. With 253 parameters refined on 2954 reflections having F > 4.0σ(F), the final R values were R = 0.0667 and Rw= 0.0651. Crystal data for 4: C44H66Al6N4O4, space group P1 (No. 2) with a = 7.821(7) Å, b = 17.890(15) Å, c = 18.668(16) Å, α = 89.10(4)°, β = 89.86(4)°, γ= 89.78(5)°, V = 2612(4) Å3, and Z = 2. With 523 parameters refined on 2068 reflections having F > 4.0σ(F), the final R values were R = 0.0690 and Rw= 0.0691. Crystal data for 5: C39H47Al3N2O2, space group monoclinic P21(No. 4) with a = 10.881(7) Å, b = 17.170(10) Å, c = 11.288(7) Å, β = 113.275(12)°, V = 1937(2) Å3 and Z = 2. With 401 parameters refined on 4313 reflections having F > 4.0σ(F), the final R values were R = 0.0619 and Rw = 0.0642.

Original languageEnglish
Pages (from-to)1453-1460
Number of pages8
JournalOrganometallics
Volume14
Issue number3
DOIs
StatePublished - Mar 1995

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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