Synthesis of the donor-acceptor ligand 2-(4-dimethylaminobenzylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (dbpcd) and X-ray diffraction structure of the platinum(II) compound PtCl2(dbpcd)·1.5CH2Cl2

Silvia Atim; Xiaoping Wang; Michael G. Richmond

doi:10.1016/j.ica.2009.11.011

Synthesis of the donor-acceptor ligand 2-(4-dimethylaminobenzylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (dbpcd) and X-ray diffraction structure of the platinum(II) compound PtCl₂(dbpcd)·1.5CH₂Cl₂

Silvia Atim, Xiaoping Wang, Michael G. Richmond

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Knoevenagel condensation of 4-(dimethylamino)benzaldehyde with 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) gives the donor-acceptor ligand 2-(4-dimethylaminobenzylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (dbpcd). The reaction of dbpcd with PtCl₂(cod) affords the platinum(II) complex PtCl₂(dbpcd) in high yield. The free dbpcd ligand and PtCl₂(dbpcd) have been isolated and fully characterized in solution by IR and NMR spectroscopies, and the solid-state structure of PtCl₂(dbpcd) determined by X-ray diffraction analysis. PtCl₂(dbpcd), as the 1.5CH₂Cl₂ solvate, crystallizes in the triclinic space group P over(1, ̄), a = 11.7412(7) Å, b = 12.0486(7) Å, c = 14.4781(9) Å, α = 82.866(1), β = 75.049(1), γ = 83.905(1), V = 1957.6(2) Å³, Z = 2, and D_calc = 1.678 mg/m³, R = 0.0291 and wR₂ = 0.0723 for 8315 reflections with I > 2σ(I). The molecular structure of PtCl₂(dbpcd)·1.5CH₂Cl₂ consists of a square-planar platinum architecture containing two chlorines and the ancillary dbpcd diphosphine ligand. The redox properties of the dbpcd ligand and PtCl₂(dbpcd) have been explored by cyclic voltammetry, and these data are discussed with respect to extended Hückel MO calculations.

Original language	English
Pages (from-to)	418-423
Number of pages	6
Journal	Inorganica Chimica Acta
Volume	363
Issue number	2
DOIs	https://doi.org/10.1016/j.ica.2009.11.011
State	Published - Jan 15 2010

Funding

Financial support from the Robert A. Welch Foundation ( Grant B-1093-MGR ) is greatly appreciated. X. Wang acknowledges the support by the US Department of Energy, Office of Science , under Contract No. DE-AC05-00OR22725 managed by UT Battelle, LLC. Ms. Nicole Ledbetter is thanked for recording the ESI mass spectrum of PtCl 2 (dbpcd).

Funders	Funder number
Robert A. Welch Foundation	B-1093-MGR
US Department of Energy
Office of Science

Keywords

Crystallography
Diphosphine ligand
MO calculations
Platinum compounds
Redox chemistry

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@article{2f317500afc34b499a58e22120a70090,

title = "Synthesis of the donor-acceptor ligand 2-(4-dimethylaminobenzylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (dbpcd) and X-ray diffraction structure of the platinum(II) compound PtCl2(dbpcd)·1.5CH2Cl2",

abstract = "Knoevenagel condensation of 4-(dimethylamino)benzaldehyde with 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) gives the donor-acceptor ligand 2-(4-dimethylaminobenzylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (dbpcd). The reaction of dbpcd with PtCl2(cod) affords the platinum(II) complex PtCl2(dbpcd) in high yield. The free dbpcd ligand and PtCl2(dbpcd) have been isolated and fully characterized in solution by IR and NMR spectroscopies, and the solid-state structure of PtCl2(dbpcd) determined by X-ray diffraction analysis. PtCl2(dbpcd), as the 1.5CH2Cl2 solvate, crystallizes in the triclinic space group P over(1,{\= }), a = 11.7412(7) {\AA}, b = 12.0486(7) {\AA}, c = 14.4781(9) {\AA}, α = 82.866(1), β = 75.049(1), γ = 83.905(1), V = 1957.6(2) {\AA}3, Z = 2, and Dcalc = 1.678 mg/m3, R = 0.0291 and wR2 = 0.0723 for 8315 reflections with I > 2σ(I). The molecular structure of PtCl2(dbpcd)·1.5CH2Cl2 consists of a square-planar platinum architecture containing two chlorines and the ancillary dbpcd diphosphine ligand. The redox properties of the dbpcd ligand and PtCl2(dbpcd) have been explored by cyclic voltammetry, and these data are discussed with respect to extended H{\"u}ckel MO calculations.",

keywords = "Crystallography, Diphosphine ligand, MO calculations, Platinum compounds, Redox chemistry",

author = "Silvia Atim and Xiaoping Wang and Richmond, {Michael G.}",

year = "2010",

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Synthesis of the donor-acceptor ligand 2-(4-dimethylaminobenzylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (dbpcd) and X-ray diffraction structure of the platinum(II) compound PtCl₂(dbpcd)·1.5CH₂Cl₂. / Atim, Silvia; Wang, Xiaoping; Richmond, Michael G.
In: Inorganica Chimica Acta, Vol. 363, No. 2, 15.01.2010, p. 418-423.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Synthesis of the donor-acceptor ligand 2-(4-dimethylaminobenzylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (dbpcd) and X-ray diffraction structure of the platinum(II) compound PtCl2(dbpcd)·1.5CH2Cl2

AU - Atim, Silvia

AU - Wang, Xiaoping

AU - Richmond, Michael G.

PY - 2010/1/15

Y1 - 2010/1/15

N2 - Knoevenagel condensation of 4-(dimethylamino)benzaldehyde with 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) gives the donor-acceptor ligand 2-(4-dimethylaminobenzylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (dbpcd). The reaction of dbpcd with PtCl2(cod) affords the platinum(II) complex PtCl2(dbpcd) in high yield. The free dbpcd ligand and PtCl2(dbpcd) have been isolated and fully characterized in solution by IR and NMR spectroscopies, and the solid-state structure of PtCl2(dbpcd) determined by X-ray diffraction analysis. PtCl2(dbpcd), as the 1.5CH2Cl2 solvate, crystallizes in the triclinic space group P over(1, ̄), a = 11.7412(7) Å, b = 12.0486(7) Å, c = 14.4781(9) Å, α = 82.866(1), β = 75.049(1), γ = 83.905(1), V = 1957.6(2) Å3, Z = 2, and Dcalc = 1.678 mg/m3, R = 0.0291 and wR2 = 0.0723 for 8315 reflections with I > 2σ(I). The molecular structure of PtCl2(dbpcd)·1.5CH2Cl2 consists of a square-planar platinum architecture containing two chlorines and the ancillary dbpcd diphosphine ligand. The redox properties of the dbpcd ligand and PtCl2(dbpcd) have been explored by cyclic voltammetry, and these data are discussed with respect to extended Hückel MO calculations.

AB - Knoevenagel condensation of 4-(dimethylamino)benzaldehyde with 4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (bpcd) gives the donor-acceptor ligand 2-(4-dimethylaminobenzylidene)-4,5-bis(diphenylphosphino)-4-cyclopenten-1,3-dione (dbpcd). The reaction of dbpcd with PtCl2(cod) affords the platinum(II) complex PtCl2(dbpcd) in high yield. The free dbpcd ligand and PtCl2(dbpcd) have been isolated and fully characterized in solution by IR and NMR spectroscopies, and the solid-state structure of PtCl2(dbpcd) determined by X-ray diffraction analysis. PtCl2(dbpcd), as the 1.5CH2Cl2 solvate, crystallizes in the triclinic space group P over(1, ̄), a = 11.7412(7) Å, b = 12.0486(7) Å, c = 14.4781(9) Å, α = 82.866(1), β = 75.049(1), γ = 83.905(1), V = 1957.6(2) Å3, Z = 2, and Dcalc = 1.678 mg/m3, R = 0.0291 and wR2 = 0.0723 for 8315 reflections with I > 2σ(I). The molecular structure of PtCl2(dbpcd)·1.5CH2Cl2 consists of a square-planar platinum architecture containing two chlorines and the ancillary dbpcd diphosphine ligand. The redox properties of the dbpcd ligand and PtCl2(dbpcd) have been explored by cyclic voltammetry, and these data are discussed with respect to extended Hückel MO calculations.

KW - Crystallography

KW - Diphosphine ligand

KW - MO calculations

KW - Platinum compounds

KW - Redox chemistry

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DO - 10.1016/j.ica.2009.11.011

M3 - Article

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JO - Inorganica Chimica Acta

JF - Inorganica Chimica Acta

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