Adaptable ligand donor strength: tracking transannular bond interactions in tris(2-pyridylmethyl)-azaphosphatrane (TPAP)

Thammavongsy, Zachary; Cunningham, Drew W.; Sutthirat, Natwara; Eisenhart, Reed J.; Ziller, Joseph W.; Yang, Jenny Y.

doi:10.1039/c8dt03180k

Adaptable ligand donor strength: tracking transannular bond interactions in tris(2-pyridylmethyl)-azaphosphatrane (TPAP)

Journal Article · Fri Sep 14 00:00:00 EDT 2018 · Dalton Transactions

DOI:https://doi.org/10.1039/c8dt03180k· OSTI ID:1611734

^[1]; ^[2]; ^[2]; Eisenhart, Reed J. ^[3]; Ziller, Joseph W. ^[2]; ^[2]

Univ. of California, Irvine, CA (United States); DOE/OSTI
Univ. of California, Irvine, CA (United States)
Univ. of Minnesota, Minneapolis, MN (United States)

Flexible ligands that can adapt their donor strength have enabled unique reactivity in a wide range of inorganic complexes. Most examples are composed of flexible multi-dentate ligands containing a donor that can vary its interaction through its distance to the metal center. We describe an alternative type of adaptable ligand interaction in the neutral multi-dentate ligand tris(2-pyridylmethyl)-azaphosphatrane (TPAP), which contains a proazaphosphatrane unit. Prozaphosphatranes are intrinsically strong phosphorus donors; upon coordination to more Lewis acidic atoms the phosphorus can accept additional electron density from a tertiary nitrogen to form a transannular bond, increasing its donor strength. An experimental and computational investigation of the varying degree of transannular interaction in TPAP when coordinated to late transition metals is reported in this paper. The synthesis and characterization of the complexes M(TPAP), where M = Co(I)Cl, Ni(0)(1,5-cyclooctadiene), Ni(II)(CH₃CN)(BF₄)₂, Pd(II)(CH₃CN)(BF₄)₂, or Pt(II)Cl(PF₆) is described. Structural characterization and density functional theory calculation of these complexes, along with the previously reported [Co(II)(TPAP)(CH₃CN)](BF₄)₂ establish significant increases in the degree of transannular interaction of the proazaphosphatrane unit when coordinated to more electron deficient metal ions.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012150

OSTI ID:: 1611734

Alternate ID(s):: OSTI ID: 1473721

Journal Information:: Dalton Transactions, Journal Name: Dalton Transactions Journal Issue: 39 Vol. 47; ISSN 1477-9226

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Adaptable ligand donor strength: tracking transannular bond interactions in tris(2-pyridylmethyl)-azaphosphatrane (TPAP)

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