Newly designed luminescent di- and tetra-nuclear double rollover cycloplatinated(II) complexes

Aghakhanpour, Reza Babadi; Nabavizadeh, S. Masoud; Rashidi, Mehdi

doi:10.1016/j.jorganchem.2016.07.007

Cited by 24 publications

(18 citation statements)

References 54 publications

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“…As shown in Scheme 1, only one geometric isomer is obtained for complexes 1-4. This suggests that the two nitrogen donor sites have a very different natures and trans influences, reinforcing the25 comparison with N^C  cyclometalated ligands. In order to gain further insight into the effect of the (N^N  ) ligand on the luminescence of the complexes, a comparative study was we compared performed forthe…”

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confidence: 61%

“…Of particular interest are Pt(II) complexes of strong field ligands like benzo[h]quinolinate (bhq) and 2phenylpyridinate (ppy -) [17][18][19][20][21][22][23]. Additionally, cycloplatinated(II) complexes bearing the rollover 2,2′-bipyridinate (bpy) ligand can also be emissive in solution or solid state [24][25][26]. Among the reported emissive Pt(II) compounds, those with the [Pt(C^N)R] moiety (C^N= cyclometalated ligand and R= alkyl, aryl or halide) are very attractive due to their ease of preparation [22,25,27,28].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, cycloplatinated(II) complexes bearing the rollover 2,2′-bipyridinate (bpy) ligand can also be emissive in solution or solid state [24][25][26]. Among the reported emissive Pt(II) compounds, those with the [Pt(C^N)R] moiety (C^N= cyclometalated ligand and R= alkyl, aryl or halide) are very attractive due to their ease of preparation [22,25,27,28]. These cyclometalated Pt(II) complexes have been synthesized through a C-H activation of ligands C^N (such as ppy, bpy and bhq) with a suitable Pt(II) precursor complex [19,[29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, structural characterization, and luminescence properties of mono- and di-nuclear platinum(II) complexes containing 2-(2-pyridyl)-benzimidazole

Niknam

Hamidizadeh

Nabavizadeh

et al. 2019

Inorganica Chimica Acta

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The starting complex [Pt(Me)(DMSO)(pbz)], (1, (pbz = 2-(2pyridyl)benzimidazolate) was prepared by a known method using the 1 reaction of [Pt(Me) 2 (DMSO) 2 ], A, with Hpbz at room temperature. Reaction of 1 with an equivalent of a phosphine ligand gave the neutral mononuclear complexes [Pt(Me)(L)(pbz)], )] ( 2, (L = PPh 3 ) or and 3, (L =PPh 2 Me). Reaction of 1 with 0.5 equivalent of the linear diphosphine 1,1'-bis(diphenylphosphino)acetylene (dppac) gave the binuclear complex [Pt 2 (Me) 2 (μ-dppac)(pbz) 2 ], 4. All Each the complexes were was fully characterized by NMR spectroscopy, X-ray crystallography and mass spectrometry. The photophysical properties of the complexes were investigated in under different conditions and interpretation was, supported by TD-DFT calculations. The low-lying transitions in the absorption and emission spectra were assigned as having LLCT/MLCT (ligand to ligand charge transfer/metal-to-ligand charge transfer) character. We also describe the luminescence properties of [Pt(Me)(PPh 3 ) (ppy)], 7, and [Pt(Me)(PPh 2 Me)(ppy)], 8, (ppy is 2-phenylpyridinate), the (N^C  ) analogues of 2 and 3.

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confidence: 61%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, structural characterization, and luminescence properties of mono- and di-nuclear platinum(II) complexes containing 2-(2-pyridyl)-benzimidazole

Niknam

Hamidizadeh

Nabavizadeh

et al. 2019

Inorganica Chimica Acta

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“…The differences found in bond distances may indicate the influence of the crystal packing on the experimental bond lengths or may come from the basis sets, which are approximated to a certain extent. 37 The data reported in Table S1 † show again that the trans influence of the P atom of PPh 3 is higher than that of the metalated N of bhq. For example for complex 2d, Pt-C bond lengths trans to the P ligating atom of the PPh 3 ligand (Pt1-C (trans to P) = 2.094 Å) are considerably longer than those of Pt-C bonds trans to the N ligating atom of bhq (Pt1-C (trans to N) = 2.077 Å).…”

Section: Papermentioning

confidence: 87%

Phosphorescent heterobimetallic complexes involving platinum(iv) and rhenium(vii) centers connected by an unsupported μ-oxido bridge

et al. 2017

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Heterobimetallic compounds [(C^N)LMePt(μ-O)ReO] (C^N = ppy, L = PPh, 2a; C^N = ppy, L = PMePh, 2b; C^N = bhq, L = PPh, 2c; C^N = bhq, L = PMePh, 2d) containing a discrete unsupported Pt(iv)-O-Re(vii) bridge have been synthesized through a targeted synthesis route. The compounds have been prepared by a single-pot synthesis in which the Pt(iv) precursor [PtMeI(C^N)L] complexes are allowed to react easily with AgReO in which the iodide ligand of the starting Pt(iv) complex is replaced by an ReO anion. In these Pt-O-Re complexes, the Pt(iv) centers have an octahedral geometry, completed by a cyclometalated bidentate ligand (C^N), two methyl groups and a phosphine ligand, while the Re(vii) centers have a tetrahedral geometry. Elemental analysis, single crystal X-ray diffraction analysis and multinuclear NMR spectroscopy are used to establish their identities. The new complexes exhibit phosphorescence emission in the solid and solution states at 298 and 77 K, which is an uncommon property of platinum complexes with an oxidation state of +4. According to DFT calculations, we found that this emission behavior in the new complexes originates from ligand centered LC (C^N) character with a slight amount of metal to ligand charge transfer (MLCT). The solid-state emission data of the corresponding cycloplatinated(iv) precursor complexes [PtMeI(C^N)L], 1a-1d, pointed out that the replacement of I by an ReO anion helps enhancing the emission efficiency besides shifting the emission wavelengths.

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“…This complex exhibited interesting luminescence properties at 298 K with a dual emission band originating from the cyclometalated ligand (intramolecular) and aggregations (intermolecular). Using this observation and our previous experiences in the field of luminescent cycloplatinated (II) complexes, we decided to design a series of cycloplatinated (II) complexes involving N 3 − and phosphine (mono and diphosphines) ancillary ligands and deprotonated 7,8‐benzo[ h ]quinoline as a C^N chelate. The products were identified by nuclear magnetic resonance (NMR) spectroscopy ( 1 H and 31 P) and in one case by X‐ray crystallography.…”

Section: Introductionmentioning

confidence: 99%

Luminescent mononuclear and dinuclear cycloplatinated (II) complexes comprising azide and phosphine ancillary ligands

Nikahd

Aghakhanpour

Nabavizadeh

et al. 2019

Applied Organom Chemis

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A new series of cycloplatinated (II) complexes with general formulas of [Pt (bhq)(N 3 )(P)] [bhq = deprotonated 7,8-benzo[h]quinoline, P = triphenyl phosphine (PPh 3 ) and methyldiphenyl phosphine], [Pt (bhq)(P^P)]N 3 [P^P = 1,1-bis (diphenylphosphino)methane (dppm) and 1,2-bis (diphenylphosphino)ethane] and [Pt 2 (bhq) 2 (μ-P^P)(N 3 ) 2 ] [P^P = dppm and 1,2-bis (diphenylphosphino) acetylene] is reported in this investigation. A combination of azide (N 3 − ) and phosphine (monodentate and bidentate) was used as ancillary ligands to study their influences on the chromophoric cyclometalated ligand. All complexes were characterized by nuclear magnetic resonance spectroscopy. To confirm the presence of the N 3 − ligand directly connected to the platinum center, complex [Pt (bhq)(N 3 )(PPh 3 )] was further characterized by single-crystal X-ray crystallography. The photophysical properties of the new products were studied by UV-Vis spectroscopy in CH 2 Cl 2 and photoluminescence spectroscopy in solid state (298 or 77 K) and in solution (77 K). Using density functional theory calculations, it was proved that, in addition to intraligand chargetransfer (ILCT) and metal-to-ligand charge-transfer (MLCT) transitions, the L ′LCT (L′ = N 3 , L = C^N) electronic transition has a remarkable contribution in low energy bands of the absorption spectra (for complexes [Pt (bhq)(N 3 ) (P)] and [Pt 2 (bhq) 2 (μ-P^P)(N 3 ) 2 ]). It is indicative of the determining role of the N 3 − ligand in electronic transitions of these complexes, specifically in the low energy region. In this regard, the photoluminescence studies indicated that the emissions in such complexes originate from a mixed 3 ILCT/ 3 MLCT (intramolecular) and also from aggregations (intermolecular). /journal/aoc 1 of 12 3 J PtH ≈ 50 Hz, 2 J PH = 21 Hz, 2H, CH 2 of dppm]; aromatic protons: 8.55 [d, 3 J HH = 8.0 Hz, 1H, H 9 of bhq]; 8.67 [t, 3 J HH ≈ 4 J PH = 3.7 Hz, 3 J PtH ≈ 23 Hz, 1 H, H 2 of bhq]; other aromatic protons: 6.8-8.4 ppm; δ ( 31 P) = 35.59 [d, 2 J PP = 42 Hz, 1 J PtP = 3364 Hz, P of dppm]; 21.78 [d, 2 J PP = 42 Hz, 3 J PtP = 1446 Hz, P of dppm].[Pt (bhq)(dppe)]N 3 , 5bDppe (40 mg, 0.1 mmol) was added to a solution of 3 (48 mg, 0.1 mmol) in acetone (20 mL). The mixture was NIKAHD ET AL. 9 of 12

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Newly designed luminescent di- and tetra-nuclear double rollover cycloplatinated(II) complexes

Cited by 24 publications

References 54 publications

Synthesis, structural characterization, and luminescence properties of mono- and di-nuclear platinum(II) complexes containing 2-(2-pyridyl)-benzimidazole

Synthesis, structural characterization, and luminescence properties of mono- and di-nuclear platinum(II) complexes containing 2-(2-pyridyl)-benzimidazole

Phosphorescent heterobimetallic complexes involving platinum(iv) and rhenium(vii) centers connected by an unsupported μ-oxido bridge

Luminescent mononuclear and dinuclear cycloplatinated (II) complexes comprising azide and phosphine ancillary ligands

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