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Kobayashi K, Sato H, Kishi S, Kato M, Ishizaka S, Kitamura N, Yamagishi A. Spectroscopic Evidence for Pt−Pt Interaction in a Langmuir−Blodgett Film of an Amphiphilic Platinum(II) Complex. J Phys Chem B 2004. [DOI: 10.1021/jp047459q] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kentaro Kobayashi
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Division of Material Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara 630-8506, and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0081, Japan
| | - Hisako Sato
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Division of Material Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara 630-8506, and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0081, Japan
| | - Shinobu Kishi
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Division of Material Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara 630-8506, and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0081, Japan
| | - Masako Kato
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Division of Material Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara 630-8506, and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0081, Japan
| | - Shoji Ishizaka
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Division of Material Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara 630-8506, and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0081, Japan
| | - Noboru Kitamura
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Division of Material Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara 630-8506, and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0081, Japan
| | - Akihiko Yamagishi
- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Division of Material Science, Graduate School of Humanities and Sciences, Nara Women's University, Nara 630-8506, and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0081, Japan
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52
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Nesper R, Pregosin PS, Püntener K, Wörle M. Homogeneous Catalysis with Dicationic PdIIComplexes: Aldol reaction of methyl isocyanoacetate with benzaldehyde. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19930760608] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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53
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Seward C, Jia WL, Wang RY, Wang S. Palladium(II) Complexes of Bowls, Pinwheels, Cages, and N,C,N-Pincers of Starburst Ligands 1,3,5-Tris(di-2-pyridylamino)benzene and 2,4,6-Tris(di-2-pyridylamino)-1,3,5-triazene. Inorg Chem 2004; 43:978-85. [PMID: 14753819 DOI: 10.1021/ic034934a] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reactions of Pd(II) ions with starburst ligands 1,3,5-tris(di-2-pyridylamino)benzene (tdab) and 2,4,6-tris(di-2-pyridylamino)-1,3,5-triazene (tdat) have been investigated. Complexes with the Pd:tdab (or tdat) ratio being 1:1 and 3:1 have been isolated and characterized. The structures of five new Pd(II) complexes containing the starburst ligands have been determined by X-ray diffraction analyses, which include chelate compounds [PdCl(2)(tdab)], 1, [(PdCl(2))(3)(tdab)], 2, [(Pd(OAc)(2))(3)(tdab)], 4, and [(Pd(OAc)(2))(3)(tdat)], 5, and a cyclometalated compound [Pd(OAc)(NCN-tdab)], 3. The Pd(II) ion in the 1:1 compound 1 is chelated by two pyridyl groups. Similarly, each Pd(II) center in the 3:1 compounds 2, 4, and 5 is chelated by two pyridyl groups. However, these three compounds display distinct structural features: 2 adopts a "bowl-shaped" structure, 4 has a "pinwheel"-like structure, and 5 has a "up-and-down" structure. Compounds 4 and 5 were examined in solution by variable-temperature (1)H NMR, which revealed that both compounds retain the "pinwheel" and the "up-and-down" structure, respectively. The observed structural preference by 4 and 5 is attributed to both electronic and steric factors.
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Affiliation(s)
- Corey Seward
- Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada
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54
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Holloway, CE, Melnik, M. Structural Aspect of Platinum Coordination Compounds: Part II. Monomeric Pt11 Compounds with PtA3B and PtA2B2 Composition. REV INORG CHEM 2003. [DOI: 10.1515/revic.2003.23.2-3.125] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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55
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Yam VWW, Hui CK, Wong KMC, Zhu N, Cheung KK. Syntheses, Structural Characterization, and Luminescence Behavior of Face-to-Face Diplatinum(II) Alkynyl Complexes. Organometallics 2002. [DOI: 10.1021/om020093o] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vivian Wing-Wah Yam
- Centre for Carbon-Rich Molecular and Nano-scale Metal-Based Materials Research and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
| | - Chi-Kuen Hui
- Centre for Carbon-Rich Molecular and Nano-scale Metal-Based Materials Research and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
| | - Keith Man-Chung Wong
- Centre for Carbon-Rich Molecular and Nano-scale Metal-Based Materials Research and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
| | - Nianyong Zhu
- Centre for Carbon-Rich Molecular and Nano-scale Metal-Based Materials Research and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
| | - Kung-Kai Cheung
- Centre for Carbon-Rich Molecular and Nano-scale Metal-Based Materials Research and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, People's Republic of China
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56
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van Slageren J, Klein A, Záliš S. Ligand-to-ligand charge transfer states and photochemical bond homolysis in metalcarbon bonded platinum complexes. Coord Chem Rev 2002. [DOI: 10.1016/s0010-8545(02)00092-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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57
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Munakata M, Zhong JC, Ino I, Kuroda-Sowa T, Maekawa M, Suenaga Y, Oiji N. 1-D cyano-bridged heterometallic complexes consisting of 1,4,8,11-tetraazacyclotetradecanesilver(II) and tetracyanopalladium(II) or tetracyanoplatinum(II). Inorganica Chim Acta 2001. [DOI: 10.1016/s0020-1693(01)00366-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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58
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Yip JH, Vittal JJ. Syntheses and electronic spectroscopy of [PtL(L')][ClO4] complexes (HL = 6-phenyl-2,2'-bipyridine; L' = pyridine, 4-aminopyridine, 2-aminopyridine, and 2,6-diaminopyridine). Inorg Chem 2000; 39:3537-43. [PMID: 11196812 DOI: 10.1021/ic9913482] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Four cyclometalated Pt(II) complexes, [PtL(L')][ClO4] [HL = 6-phenyl-2,2'-bipyridine; L' = pyridine (1), 4-aminopyridine (2), 2-aminopyridine (3), 2,6-diaminopyridine (4)], were designed and synthesized to probe intramolecular N...Pt interactions. The crystal structures of the compounds show that the pyridine ligands are almost perpendicular to the planes of the molecules. In addition, the pendant NH2 groups of the 2-aminopyridine and 2,6-diaminopyridine ligands are close to the metal centers in complexes 3 and 4, with the Pt-N(H2) distances (3.065(3)-3.107(3) A) significantly shorter than the sum of the van der Waals radii of Pt and N. These compounds were also studied by electronic spectroscopy. All the complexes display intense intraligand pi-->pi* transitions at 200-340 nm (epsilon = 10(4)-10(3) M-1 cm-1) and moderately intense (epsilon approximately 10(3) M-1 cm-1) metal (Pt)-to-ligand (pi*) charge-transfer (MLCT) transitions. For 1 and 2, the MLCT transitions occur at approximately 390 nm, but the MLCT transition of 4 is exceptionally low in energy (492 nm). The low-temperature emission spectra of the complexes in frozen EMD glass indicate that 3 pi pi* is the emissive excited state for 1 and 2 but the emission of 3 is from a 3MLCT excited state. On the basis of the spectroscopic results, the order of energy of the MLCT excited states is established as 1 approximately 2 > 3 > 4. It is proposed that the red shifts of the MLCT transitions in 3 and 4 are due to increased electron-donating abilities of the ancillary pyridine ligands and intramolecular interactions between the orbitals of amine nitrogen lone pairs. Crystal data for the complexes are as follows. 1: triclinic P1, Z = 2, a = 8.7917(2) A, b = 10.6398(3) A, c = 11.9592(3) A, alpha = 107.130(1) degrees, beta = 92.522(1) degrees, gamma = 111.509(1) degrees. 2.CH3CN: triclinic P1, Z = 2, a = 7.0122(4) A, b = 12.9653(8) A, c = 14.0283(9) A, alpha = 107.3100(10) degrees, beta = 102.7640(10) degrees, gamma = 91.6320(10) degrees. 3.CH3CN: triclinic P1, Z = 2, a = 7.6459(1) A, b = 10.8433(1) A, c = 14.8722(2) A, alpha = 99.383(1) degrees, beta = 93.494(1) degrees, gamma = 101.385(1) degrees. 4.CH3CN: triclinic P1, Z = 2, a = 7.862(2) A, b = 10.977(3) A, c = 14.816(5) A, alpha = 99.34(2) degrees, beta = 92.64(2) degrees, gamma = 104.11(2) degrees.
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Affiliation(s)
- J H Yip
- Department of Chemistry, National University of Singapore, 10 Kent Ridge Crescent, 119260 Singapore.
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59
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Funayama T, Kato M, Kosugi H, Yagi M, Higuchi J, Yamauchi S. Studies of the Lowest Excited Triplet State of 3,3′-Biisoquinoline(dicyano)platinum(II) [Pt(CN)2(i-biq)] by Means of Time-Resolved Electron Paramagnetic Resonance and Optical Spectroscopy. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2000. [DOI: 10.1246/bcsj.73.1541] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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60
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DePriest J, Zheng GY, Goswami N, Eichhorn DM, Woods C, Rillema DP. Structure, physical, and photophysical properties of platinum(II) complexes containing bidentate aromatic and bis(diphenylphosphino)methane as ligands. Inorg Chem 2000; 39:1955-63. [PMID: 11434320 DOI: 10.1021/ic991306d] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This study focuses on a series of PtII(L-L')(dppm)n+ complexes, where dppm is bis(diphenylphosphino)methane and L-L' are C-C' (n = 0), C-N (n = 1), and N-N' (n = 2) aromatic ligands. Structural characteristics are as follows: for [Pt(phen)(dppm)](PF6)2, a N-N' derivative, monoclinic, C2/c, a = 33.583(6) A, b = 11.399(2) A, c = 22.158(4) A, Z = 8; for [Pt(phq)(dppm)](PF6), a C-N derivative, triclinic, P1, a = 11.415(3) A, b = 13.450(3) A, c = 14.210(4) A, Z = 2; for [Pt(phpy)(dppm)](PF6), a C-N derivative, triclinic, P1, a = 10.030(3) A, b = 13.010(2) A, c = 15.066(4) A, Z = 2; and for [Pt(bph)(dppm)], a C-C' derivative, P2(1)/c, a = 17.116(7) A, b = 21.422(6) A, c = 26.528(6) A, Z = 12, where phen is 1,10-phenanthroline, phq is 2-phenylquinoline, phpy is 2-phenylpyridine, and bph is 2,2'-biphenyl. Structural features indicate that the Pt-C bond distance is shorter than the Pt-N bond distance in symmetrical complexes and that the Pt-P bond distance trans to N is shorter than the Pt-P bond trans to C. This is consistent with the 31P NMR spectra where the chemical shift of the P trans to C is approximately 10 ppm less than found for P trans to N. The energy maxima of the metal-to-ligand charge-transfer band for the complexes containing various L-L' ligands occur in the near-UV region of the spectrum and fall into the energy series bpy > bph > phen > 2-phpy > 2-ptpy > 2-phq > 7,8-bzq, where bpy is 2,2'-bipyridine, 2-phpy is 2-phenylpyridine, 2-ptpy is 2-p-tolylpyridine, and 7,8-bzq is 7,8-benzoquinoline. The emission energy maxima, ascribed to variance in metal-perturbed triplet ligand centered emission, commence near 500 nm and follow the series phen > bpy > 7,8-bzq > 2-phpy > 2-ptpy > bph > 2-phq. In general, emission is observed at 77 K and in solution at low temperatures, but the temperature dependence of the emission lifetimes indicates thermal activation to another state occurs with an energy of approximately 1800 cm-1 for the complexes, with the exception of [Pt(bph)(dppm)], which has an activation energy of approximately 2300 cm-1.
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Affiliation(s)
- J DePriest
- Department of Chemistry, Wichita State University, Wichita, Kansas 67260-0051, USA
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61
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Crystal structures and spectroscopic properties of platina-β-diketones — a new mode of stacking in platinum complexes. J Organomet Chem 2000. [DOI: 10.1016/s0022-328x(99)00726-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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62
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Lai SW, Cheung TC, Chan MC, Cheung KK, Peng SM, Che CM. Luminescent mononuclear and binuclear cyclometalated palladium(II) complexes of 6-phenyl-2,2 bipyridines: spectroscopic and structural comparisons with platinum(II) analogues. Inorg Chem 2000; 39:255-62. [PMID: 11272533 DOI: 10.1021/ic991089g] [Citation(s) in RCA: 143] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The mononuclear cyclometalated Pd(II) complexes [Pd(L1)X] (HL1 = 6-phenyl-2,2'-bipyridine; X = Cl, la; Br, 1b; I, 1c), [Pd(L1)PPh3]+ (1d), [Pd(L2-5)Cl] [2a-5a, HL2-5 = 4-(aryl)-6-phenyl-2,2'-bipyridine; aryl = phenyl (2), 4-chlorophenyl (3), 4-tolyl (4), 4-methoxyphenyl (5)] and the binuclear derivatives [Pd2(L1-5)2(mu-dppm)]2+ (1e-5e, dppm = bis(diphenylphosphino)methane) and [Pd2(L1)2(mu-dppCs)]2+, (1f, dppC5 = 1,5-bis(diphenylphosphino)pentane) were prepared. The crystal structures of 1d(ClO4), 1e(ClO4)2 x DMF, and 2e(ClO4)2 have been determined by X-ray crystallography. The magnitude of the Pd-Pd distances in le and 2e (3.230(1) and 3.320(2) A, respectively) suggest minimal metal-metal interaction, although pi-stacking of the aromatic ligands (interplanar separations 3.34 and 3.35 A, respectively) is evident. All complexes display low-energy UV absorptions at lambda approximately 390 nm, which are tentatively assigned to 1MLCT transitions; red shifts resulting from Pd-Pd interactions in the binuclear species are not apparent. The complexes in this work are non-emissive at 298 K, but the cationic derivatives exhibit intense luminescence at 77 K. The structured emissions of 1d and 1f in MeOH/EtOH glass (lambdamax 467-586 nm) and all cationic species in the solid state (lambdamax 493-578 nm) are assigned to intraligand excited states. Complexes le-5e display dual emissions in MeOH/EtOH glass at 77 K, and the broad structureless bands at lambdamax 626-658 nm are attributed to pi-pi excimeric IL transitions. A comparison between the photophysical properties of Pd(II) and Pt(II) congeners is presented.
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Affiliation(s)
- S W Lai
- Department of Chemistry, The University of Hong Kong, Hong Kong
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63
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Lai SW, Chan MCW, Cheung TC, Peng SM, Che CM. Probing d8−d8Interactions in Luminescent Mono- and Binuclear Cyclometalated Platinum(II) Complexes of 6-Phenyl-2,2‘-bipyridines. Inorg Chem 1999. [DOI: 10.1021/ic990238s] [Citation(s) in RCA: 288] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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64
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Klein A, Hasenzahl S, Kaim W, Fiedler J. On the Question of Mixed-Valent States in Ligand-Bridged Dinuclear Organoplatinum Compounds [RkPt(μ-L)PtRk]n, k = 2 or 4. Organometallics 1998. [DOI: 10.1021/om980107j] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Axel Klein
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Steffen Hasenzahl
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Wolfgang Kaim
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
| | - Jan Fiedler
- J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 18223 Prague, Czech Republic
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65
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Nickel(II), palladium(II), platinum(II) and platinum(IV) complexes of cis-1,2-bis(diphenylphosphino) ethene and nitrogen-containing heterocycles or sulfur ligands. Inorganica Chim Acta 1998. [DOI: 10.1016/s0020-1693(97)06041-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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66
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Paw W, Cummings SD, Adnan Mansour M, Connick WB, Geiger DK, Eisenberg R. Luminescent platinum complexes: tuning and using the excited state. Coord Chem Rev 1998. [DOI: 10.1016/s0010-8545(98)90023-6] [Citation(s) in RCA: 207] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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67
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Crosby G, Kendrick K. Assignment of the triplet manifolds of d8 complexes and linear chains via the effects of temperature and magnetic fields on the phosphorescence lifetimes. Coord Chem Rev 1998. [DOI: 10.1016/s0010-8545(98)90063-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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68
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Zheng GY, Rillema DP. Comparison of Solid-State and Solution Photophysical Properties of a Platinum(II) Biphenyl Dicarbonyl Complex: A Multiple-State Emission Study. Inorg Chem 1998; 37:1392-1397. [PMID: 11670351 DOI: 10.1021/ic970594f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pt(bph)(CO)(2), where bph is the biphenyl dianion, displays multiple emission by altering the temperature, solvent, or its state. Emission spectra and emission quantum yields are concentration and excitation wavelength dependent. In dilute 4:1 ethanol/methanol at room temperature, a structured emission at high energy ( approximately 500 nm) occurs, but in the solid state a nonstructured emission centered at ( approximately 750 nm) is found. Between these extremes, two other emissions located at approximately 540 and approximately 650 nm are observed. Emissions from high energy to low energy are attributed to the following: triplet emission centered on the bph ligand, emission from a dimer (exciplex), emission from an aggregate, and emission from "stacked" platinum(II) crystals.
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Affiliation(s)
- Greg Y. Zheng
- Department of Chemistry, Wichita State University, Wichita, Kansas 67260-0051
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69
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Kaim W, Klein A, Hasenzahl S, Stoll H, Záliš S, Fiedler J. Reactions of New Organoplatinum(II) and -(IV) Complexes of 1,4-Diaza-1,3-butadienes with Light and Electrons. Emission vs Photochemistry and the Electronic Structures of Ground, Reduced, Oxidized, and Low-Lying Charge-Transfer Excited States. Organometallics 1998. [DOI: 10.1021/om970736d] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Hermann Stoll
- Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
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70
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Affiliation(s)
- William B. Connick
- Contribution from the Beckman Institute, California Institute of Technology, Pasadena, California 91125
| | - Harry B. Gray
- Contribution from the Beckman Institute, California Institute of Technology, Pasadena, California 91125
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71
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72
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Electronic and molecular structure of 2,2′-bipyrimidine-bridged bis(organoplatinum) complexes in various oxidation states. Radical-bridged diplatinum species and the absence of a Pt(III)/Pt(II) mixed-valent intermediate. Inorganica Chim Acta 1997. [DOI: 10.1016/s0020-1693(97)05704-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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73
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Aullón G, Alvarez S. Chain Conformation and Metal…Metal Contacts in Dimers and Stacks of d8-ML4 Complexes: Electronic Effects. Chemistry 1997. [DOI: 10.1002/chem.19970030422] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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74
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Stasicka Z, Wasielewska E. Photosubstitution and photoredox behaviour of cyanometallates: reaction models. Coord Chem Rev 1997. [DOI: 10.1016/s0010-8545(96)01310-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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75
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Connick WB, Marsh RE, Schaefer WP, Gray HB. Linear-Chain Structures of Platinum(II) Diimine Complexes. Inorg Chem 1997. [DOI: 10.1021/ic961232v] [Citation(s) in RCA: 295] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- William B. Connick
- Beckman Institute, California Institute of Technology, Pasadena, California 91125
| | - Richard E. Marsh
- Beckman Institute, California Institute of Technology, Pasadena, California 91125
| | - William P. Schaefer
- Beckman Institute, California Institute of Technology, Pasadena, California 91125
| | - Harry B. Gray
- Beckman Institute, California Institute of Technology, Pasadena, California 91125
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76
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Kato M, Sasano K, Kosuge C, Yamazaki M, Yano S, Kimura M. Crystal Structures and Luminescence Properties of Platinum(II) Complexes Containing 3,3'-Biisoquinoline. Inorg Chem 1996; 35:116-123. [PMID: 11666172 DOI: 10.1021/ic9507124] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Three new platinum complexes containing 3,3'-biisoquinoline (i-biq), [Pt(CN)(2)(i-biq)] (1), [PtCl(2)(i-biq)] (2), and [Pt(i-biq)(2)](PF(6))(2) (3), have been synthesized as orange-red, yellow, and colorless crystals, respectively. Their crystal structures and luminescence properties are reported. Crystal data: for 1.0.5H(2)O, PtO(0.5)N(4)C(20)H(13), orthorhombic, Pbcm, a = 13.989(2) Å, b = 18.304(1) Å, c = 6.682(3) Å, V = 1710.9(6) Å(3), Z = 4, and final R = 0.039 (R(w) = 0.033) for 970 independent reflections; for 2.DMF.H(2)O, PtCl(2)O(2)N(3)C(21)H(21), triclinic, P&onemacr;, a = 11.047(1) Å, b = 12.397(3) Å, c = 8.000(2) Å, alpha = 106.56(1) degrees, beta = 100.15(1) degrees, gamma = 76.15(1) degrees, V = 1012.8(3) Å(3), Z = 2, and final R = 0.058 (R(w) = 0.077) for 4219 independent reflections; for 3.2DMF, PtP(2)F(12)O(2)N(6)C(42)H(38), triclinic, P&onemacr;, a = 10.795(2) Å, b = 13.511(2) Å, c = 8.281(1) Å, alpha = 105.22(1) degrees, beta = 112.17(1) degrees, gamma = 85.02(1) degrees, V = 1079.2(3) Å(3), Z = 1, and final R = 0.038 (R(w) = 0.042) for 3606 independent reflections. Square-planar complexes of 1 are stacked in the crystal to form a columnar structure with the Pt-Pt distance of 3.34 Å. The crystal emits strongly, even at room temperature, and the emission spectrum is similar to that for the [Pt(CN)(2)(bpy)] crystal (bpy = 2,2'-bipyridine), which is due to a (3)dpi[dsigma(Pt) --> pi(i-biq)] transition. The single crystal emission spectrum at 77 K is, however, observed as a superposition of broad (3)dpi and sharp (3)pipi(i-biq) emissions. The crystal structure of 2 has a completely different stacking structure from that of 1. The stacking occurs on the i-biq ligands, and the Pt atoms are separated more than 6 Å. The complex exhibits only a structured emission component assigned to the (3)pipi(i-biq) transition in the crystal at 77 K, in agreement with the crystal structure with no Pt-Pt interaction. In the crystal of 3, the [Pt(i-biq)(2)](2+) complexes are stacked but offset, being in close contact between parts of adjacent i-biq ligands. There is no Pt-Pt interaction also in this case. Two i-biq ligands in the complex are distorted to adopt the bowed conformation due to the steric crowding of the alpha-hydrogens on opposite ligands. Nevertheless, 3 provides almost the same (3)pipi emission spectrum as 1 and 2 in dilute glassy solution at 77 K. The (3)pipi emission spectra observed in the crystals of these Pt(II) complexes are red-shifted compared with those in dilute glassy solution. The fact is attributable to the pi-pi intermolecular interactions between the ligands in the crystals. The factors controlling the crystal structures for these complexes are also discussed.
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Affiliation(s)
- Masako Kato
- Department of Chemistry, Faculty of Science, Nara Women's University, Nara 630, Japan, and Rigaku Corporation, Akishima, Tokyo 196, Japan
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