J. Am. Chem. Soc. 2008 , 130 , 14659–14674

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1 Systematic Synthesis, Isolation, an d Photophysical Properties of Linear-Shaped Re(I) Oligomers an d Polymers with 2-20 Units Youhei Yamamoto, Shuhei Sawa, Yusuke Funada, Tatsuki Morimoto, Magnus Falkenstro¨m, Hiroshi Miyasaka, Say aka Shishido, Tomoji Ozeki, Kazuhide Koike, and Osam u Ishitani* J. Am. Chem. Soc. 2008, 130, 14659–14674 ，

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Systematic Synthesis, Isolation, and Photophysical Properties of Linear-Shaped Re(I) Oligomers and Polymers with 2 - 20 Units. ，. - PowerPoint PPT Presentation

Transcript of J. Am. Chem. Soc. 2008 , 130 , 14659–14674

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Systematic Synthesis, Isolation, and Photophysical Properties

of Linear-Shaped Re(I) Oligomers and Polymers with 2-20 Units

Youhei Yamamoto, Shuhei Sawa, Yusuke Funada, Tatsuki Morimoto, Magnus Falkenstro¨m, Hiroshi Miyasaka, Sayaka Shishido, Tomoji Oze

ki, Kazuhide Koike, and Osamu Ishitani*

J. Am. Chem. Soc. 2008, 130, 14659–14674

，

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Linear-Shaped Metal Oligomers

Shie-Ming Peng .Angen. Chem. Inr. Ed. Engl. 1997, 36, 56

[Co5(5-tpda)4(NCS)2] [Ni5(5-tpda)4CI2]

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Motivation

• Excellent emitters Room-temperature luminescence, long lifetime

High emission quantum yield

• Molecular-scale photonic wires

N

N

ReCO

COCO

X

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Photochemical Ligand Substitution Reaction

Ishitani, O, et. Al, J. Am. Chem. Soc. 2002, 124, 11448–11455.

Schoonover, J. R. et. al, Inorg. Chem. 2001, 40, 5056–5057.

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Synthesis of a linear-shaped rhenium(I)diimine complexes

Ishitani, O, et. Al, Chem. Commun., 2001, 1514–1515

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Photophysical Properties of linear-shaped rhenium(I) diimine complexes

Ishitani, O, et. Al, Chem. Commun., 2001, 1514–1515

Fig. 1 (b) emission spectra (350 nm excitation)of 14+, 2b3+, 32+ and 5+ in acetonitrile.

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Synthetic Strategy

LL

x

“Target molecules”

“Complex as ligand”

“Complex as metal”

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Synthesis of Linear-Shaped Rhenium(I) Complexes

(i) h (>330 nm) in CH2Cl2 for 30 min; (ii) excess ac in CH2Cl2 at room temperature for 1 day, then at 40 °C for 1 day; (iii) fac-Re(bpy)(CO)3(CF3SO3) in CH2Cl2 at room temperature for 1 day, then at 40 °C for 1 day; (iv) ac (0.5 equiv) in CH2Cl2 at room temperature for 1 day, then at 40 °C for 1 day.

0.5 eq ac

h (>330 nm)

excess ac

fac-Re(bpy)(CO)3(CF3SO3)

ac = -PPh2-CC-PPh2-

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Synthesis of Oligomers with 5 and 7 Re(I) Units

(i) h (>330 nm) in CH2Cl2 for 1 h;(ii) [Re2ac(η1-ac)1]2+ in CH2Cl2 at room temperature for 1 day, then at 40 °C for 1 day.

Yield = 32%

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Synthesis [Re5ac]5+ in higher yield

Yield = 66%

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Synthesis of Linear-Shaped Re(I) Polymers

(i) h (>330 nm) in MeCN for 1 h; (ii) excess ac in acetone/THF (1:1) at room temperature for 1 day, then at 40 °C for 1 day; (iii) in acetone/THF (1:1) at room temperature for 1 day, then at 40 °C for 2 days.

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Separation Using Size Exclusion Chromatography

Figure S3. Chromatograms of analytical SEC. Reaction mixture (a), with isolation of [Re5ac]5+, [Re10ac]10+, [Re15ac]15+, and [Re20ac]20+. The eluent was a 1:1 (v/v) mixture of methanol and acetonitrile containing 0.3 M CH3CO2NH4, and the flow rate was 5.0 ml min-1. The detection wavelength was 360 nm.

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ESI FTMS spectrum of [Re8ac]8+(PF6-)8.

Figure 1. ESI FTMS spectrum of [Re8ac]8+(PF6-)8. The

eluent was MeCN.

ESI FTMS = electrospray ionization Fourier transform mass spectrometry

Figure 2. ESI FTMS spectrum of the scale-extended segment for the seven charged [M + (PF6

-)]7+ (a) and calculated isotope distribution patterns(b).

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Aromatic regions in 1H NMR spectra

H4

H5

H6

H3

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Aromatic regions in 1H NMR spectra

Hi6 Hi

3 Hi4

Hii5

Hii5+Hiii

5

xiHA

iiiHiiHA5.01

)6(

)55(

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Identify the Longest Isolated Polymer Made from [Re5ac]5+ by 1H NMR

Figure 4. Relationship between the number of Re(I) units in the oligomers and polymers and ratios of the integrated areas of their 1H NMR signals,A(H5

i + H5ii)/A(H6

iii) (n = 3, 4, 6), measured in acetone-d3 at room temperature. See the structure as shown in Figure 3 for numbering of the protons. The red circle is the longest isolated polymer made from [Re5ac] 5+.

the number of Re(I) units is 20.42.0

xniHA

iiiHiiHA5.01

)(

)55(

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(edge Re-CO)

(interior Re-CO)

IR spectra

[Re2ac]2+

Figure 5. IR spectra of [Re2ac]2+ (dotted line), [Re4ac]4+ (blue line), [Re6ac]6+ (red line), and [Re8ac]8+ (solid black line) measured in MeCN. They are standardized by t

he absorbance at 2048 cm-1.

[Re6ac]6+

[Re4ac]4+

[Re8ac]8+

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Identify the Longest Isolated Polymer Made from [Re5ac]5+ by Ratio of (CO)

Figure 6. Relationship between the ratios of the ν(CO) peak areas due to edge units (2048 cm-1) and interior units (1885 cm-1) of [Re2ac]2+ to [Re16ac]16+ (black dots), and the number of Re(I) units. The red circle is the polymer for the longest isolated polymer made from [Re5ac]5+.

the number of Re(I) units is 20.10.4

x..)cmA(

)cmA(4201079060

12048

11885

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Identify the Longest Isolated Polymer Made from [Re5ac]5+ by Size Exclusion Chromatography.

Figure 7. The logarithm of the molecular weight plotted against the distribution coefficient (KSEC) of the Re(I) oligomers and polymers. The red circle shows the longest isolated polymer made from [Re5ac]5+.

the number of Re(I) units is 20.63.7

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ORTEP diagram of [Re2ac]2+(PF6-)2

Bond Angles

Bond Lengths

“Trans” - type

π-π interaction

Inversion center

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Packing diagram of [Re2ac]2+(PF6-)2

π-π interaction

Figure S4. Packing diagram of [Re2ac]2+(PF6-)2, PF6

- and hydrogen atoms omitted for clarity.

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ORTEP diagram of [Re3ac]3+(PF6-)3

U-shaped

Bond Angles

Bond Lengths

Mirror plane

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Bond Angles

Bond Lengths

ORTEP diagram of [Re3et]3+(PF6-)3

U-shaped et = -PPh2-(CH2)2-PPh2-

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ORTEP diagram of [Re4et]4+(PF6-)4

Circle-like structure

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UV-vis absorption spectra

Figure 9. UV-vis absorption spectra of MeCN solutions containing [Re2ac]2+ to [Re20ac]20+

MLCT

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Subtracted spectra UV-vis absorption spectrum

Figure 10. Subtracted spectra UV-vis absorption spectrum of [Re2et]2+ from those of [Re3et]3+ - [Re7et]7+, divided by the number of the biscarbonyl complex units; the red line is the UV-vis absorption spectrum of fac-[Re(bpy)(CO)2(PPh2Pr)2]+ in MeCN.

Figure 9. Subtracted spectra UV-vis absorption spectrum of [Re2ac]2+ from those of [Re3ac]3+ to [Re20ac]20+, divided by the number of biscarbonyl complex units .

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Emission spectra

Figure 11. Emission spectra from degassed MeCN solutions containing [Re2ac]2+ to [Re20ac]20+ standardized by the absorbance at the excitation wavelength 350 nm.

Red shift

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Emission decay curves of [Re8ac]8+

Emission decay curves obtained at excitation wavelength of 365 nm.

(a) Monitor : 500 nm (b) Monitor : 650 nm

Main: 10 nsMinor: 100 ns, 734 ns

Main: 113 ns, 750 nsMinor: 10 ns

Iem(t)= A1 et⁄τ1 + A2 et⁄τ2 +A3 et⁄τ3

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Time resolved emission spectra of [Re8ac]8+

Figure 13. Time resolved emission spectra of [Re8ac]8+. Black, red, and blue lines are emission spectra with lifetime of 10, 100, and 750 ns,respectively.

= 10 ns is emission from the 3MLCT excited-state of the edge Re(I) units.

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Photophysical Properties

Table 3. Photophysical Properties of [Re2ac]2+ to [Re20ac]20+ in a Deoxygenated Acetonitrile Solution at 25 °C, and Energy Transfer Rates from the Edge Unit to the Interior Unit in [Re3ac]3+ to [Re20ac]20+

aAll complexes were PF6- salts. The excitation wavelength was 350 nm. bEmission maximum. cQuantum yield of e

mission. dLifetime. Numbers in parentheses are percentages of pre-exponential factors,

Ket Kr

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MeCN/toluene mixed solution effect em

Figure 14. Dependence of Φem on toluene content in an MeCN/toluene mixed solution.

cis,trans-[Re(bpy)(CO)2(PPh3)2]+

em Kr

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Conclusions• We applied photochemical ligand substitution reactions of Re(I)

diimine complexes with a phosphorus ligand, to find systematic synthetic routes for linear-shaped rhenium(I) oligomers and polymers bridged with bidentate phosphorus ligands.

• For oligomers and polymers with 3 Re(I) units, energy transfer from the edge unit to the interior unit occurs with a rate constant of (0.9 × 108)-(2.5 × 108) s-1.

• Crystal structures were obtained of some trimers and a tetramer, showing interligand π-π interaction between the diimine ligand and the phenyl groups on the phosphorus ligand.

• Both emission and analytical SEC data indicate that the Re(I) polymers aggregate intramolecularly in an MeCN solution.


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