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Synthesis and Structure of bis(β-Diketiminate) Chromium(II) Complexes

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Abstract

The new ligand 2,4-N,N′-bis(napthylamino)-pent-2-ene (Lnapth) (1) has been synthesized and crystallizes in space group P212121 with crystal cell parameters a = 8.196(3) Å, b = 9.119(3) Å, c = 25.746(10) Å, V = 1924.3(12) Å3 and Z = 4. The complexes bis[2,4-pentane-N,N′-bis(napthyl)ketiminato] chromium(II) (2), bis[2,4-pentane-N,N′-bis(isopropylphenyl)ketiminato] chromium(II) (3), and bis[2,4-pentane-N,N′-bis(tertbutylphenyl)ketiminato] chromium(II) (4) were synthesized and structurally characterized. Complex 2, the first complex reported with a bis(napthyl) β-diketiminate ligand, crystallizes in space group P − 1 with crystal cell parameters a = 12.0824(15) Å, b = 12.2462(16) Å, c = 14.8975(19) Å, α = 87.035(2)°, β = 80.615(2)°, γ = 62.756(2)°, V = 1932.9(4) Å3 and Z = 2. Complex 3 crystallizes in space group P21/n with crystal cell parameters a = 13.088(3) Å, b = 22.222(5) Å, c = 14.206(3) Å, β = 102.310(4)°, V = 4036.6(17) Å3 and Z = 4. Complex 4 crystallizes in space group P21/n with crystal cell parameters a = 20.831(6) Å, b = 11.575(4) Å, c = 21.373(7) Å, β = 107.241(5)°, V = 4922(3) Å3 and Z = 4. The degree of twist between the ligand planes is dependent on the steric bulk of the ligand.

Graphical Abstract

Three bis(β-diketiminate) chromium(II) complexes have been synthesized and structurally characterized. The degree of twist between the ligands was observed to be dependent on the steric bulk of the ligand.

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Acknowledgments

This research was supported by NSF (CHE-0616375) and DOE (DE-FG02-92ER14273).

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, 19716, USA

    Wesley H. Monillas, Tyler C. Bazzoli, Glenn P. A. Yap & Klaus H. Theopold

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  1. Wesley H. Monillas
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  2. Tyler C. Bazzoli
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  3. Glenn P. A. Yap
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  4. Klaus H. Theopold
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Correspondence to Glenn P. A. Yap.

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Monillas, W.H., Bazzoli, T.C., Yap, G.P.A. et al. Synthesis and Structure of bis(β-Diketiminate) Chromium(II) Complexes. J Chem Crystallogr 40, 67–71 (2010). https://doi.org/10.1007/s10870-009-9627-8

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