Origin of Polychromism of Cis Square-Planar Platinum(II) Complexes: Comparison of Two Forms of [Pt(2,2'-bpy)(Cl2]

Herber, R. H.; Croft, Mark; Coyer, M. J.; Bilash, B.; Sahiner, A.

doi:10.1021/ic00089a018

Cited by 157 publications

(92 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…On the basis of our previous work (17)(18)(19)(20)(21) and other related studies (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16), the newly formed UV-vis bands of complexes 1 and 2 at longer wavelength are assigned as MMLCT transitions, as a result of the self-assembly of the complexes induced by the oligonucleotides through metal⅐⅐⅐metal and ⅐⅐⅐ interactions. The newly formed emission bands are attributed to MMLCT triplet emission.…”

Section: Resultsmentioning

confidence: 83%

“…Depending on the extent of the metal⅐⅐⅐metal and the ligand ⅐⅐⅐ stacking interactions, different colors could be observed (3,4). Square planar platinum(II) complexes belong to a particularly interesting class of this type of complexes, as a result of their rich spectroscopic and luminescence properties revealed during the past few decades (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Single-stranded nucleic acid-induced helical self-assembly of alkynylplatinum(II) terpyridyl complexes

Chan

Wong

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

172

124

View full text Add to dashboard Cite

Single-stranded nucleic acids, which carry multiple negative charges in an aqueous medium at near neutral pH, are found to induce the aggregation and self-assembly of the positively charged alkynylplatinum(II) terpyridyl complexes via electrostatic binding of the platinum complexes to the single-stranded nucleic acids, as revealed by the appearance of new UV-vis absorption and emission bands upon addition of single-stranded nucleic acids to a buffer solution of the complex. Changes in the intensity and pattern of circular dichroism (CD) spectroscopy are also observed, many of which are consistent with the assembly of the platinum complexes into helical structures, via metal⅐⅐⅐metal and ⅐⅐⅐ stacking interactions. The induced spectroscopic property changes are found to depend on the structural properties of the nucleic acids.helicity ͉ noncovalent interactions ͉ platinum complex N ucleic acids are, in a sense, the most fundamental and important class of biomolecules in a living cell. Detection of nucleic acids, analysis of their sequence, structure, and the corresponding properties, as well as their self-replication, interactions with regulation factors, and the details of transcription and translation are among the major foci of numerous biochemical and biophysical research works (1, 2). Single-stranded nucleic acid sensing and characterization are therefore of great importance, which not only can help us to understand how the cell functions and to assist biological research, but also facilitate the development of new tools for disease diagnosis and treatment and new drug developments.It has been known for many years that many of the square planar metal complexes arrange themselves into highly ordered extended linear chain or oligomeric structures in the solid state. Depending on the extent of the metal⅐⅐⅐metal and the ligand ⅐⅐⅐ stacking interactions, different colors could be observed (3, 4). Square planar platinum(II) complexes belong to a particularly interesting class of this type of complexes, as a result of their rich spectroscopic and luminescence properties revealed during the past few decades (3-16).Recently, we have synthesized a number of platinum(II) polypyridyl alkynyl complexes that show interesting spectroscopic and luminescence properties (17-21). One particularly interesting observation is that solvents of different polarity and also polyacrylate could induce the aggregation of the positively charged platinum complexes in organic solvent mixtures (19, 21). As a result, remarkable spectroscopic property changes were observed. Because single-stranded nucleic acids carry multiple negatively charged phosphate functional groups, they are polyanions. It is therefore reasonable to envisage that single-stranded nucleic acids may have the possibility to induce the self-assembly of the square planar platinum(II) complexes in an aqueous environment. Here, we describe the synthesis and characterization of a water-soluble platinum(II) terpyridyl alkynyl complex, [Pt(tpy)C'CC'CCH 2 OH]OTf (1) (Fig. 1), and it...

show abstract

Section: Resultsmentioning

confidence: 83%

mentioning

confidence: 99%

Single-stranded nucleic acid-induced helical self-assembly of alkynylplatinum(II) terpyridyl complexes

Chan

Wong

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

172

124

View full text Add to dashboard Cite

show abstract

“…Typical examples are the well-studied tetracyanoplatinates [23,[45][46][47][48] and compounds with a-diimine ligands, like Pt(bpy)Cl2 [49][50][51][52][53][54]…”

Section: [Pt(bpy)2] §mentioning

confidence: 99%

Characterization of excited electronic and vibronic states of platinum metal compounds with chelate ligands by highly frequency-resolved and time-resolved spectra

Yersin

Humbs

Strasser

1997

Topics in Current Chemistry

133

View full text Add to dashboard Cite

The lowest excited electronic states of triplet character and related vibronic properties are discussed in detail on the basis of highly frequency-resolved and time-resolved emission and excitation spectra of per-protonated, per-deuterated, and partially deuterated [Pt(bpy)2] 2+, [Rh(bpy)3] 3+, [Ru(bpy)3] 2+, and [Os(bpy)3] ~+. Emphasis is placed on the use of the enormous amount of information displayed in well-resolved vibrational satellite structures. For comparison, IR data and Raman spectra are also used. In addition, data are given for [Ru(bpz)Pt(3-thpy) 2, Pt(2-thpy)(CO)(Cl), Pt(2-thpy) 2, Pt(qol)2, Pt(qtl)2. Trends and effects are also addressed, which are related to the amount of metal d-orbital mixing. In particular, we discuss the role of traps and sites in the context of high-resolution, site-selective, and line-narrowed spectra of chromophores doped into matrices; the interplay between states of ligand-centered 3rtrr* and ~MLCT character; localization versus delocalization behavior; radiative decay properties; zero-field splittings; spin-lattice relaxations via direct and Orbach mechanisms; Arrhenius behavior after time delay; Franck-Condon activities and Huang-Rhys factors; Franck-Condon versus Herzberg Teller activities and tunability of these activities under high magnetic fields; isotope marking and deuteration effects; aggregate formation of [Ru(bpy)3]2+; and radiationless energy transfer in neat [Ru(bpy)3](PF6) 2. These effects are in part treated in detail, but the aim is to use easy-to-follow descriptions. In particular, it is emphasized throughout this review that chemical tunability opens fascinating possibilities for controlled variation of physical properties.

show abstract

“…We note that in better investigated compounds of platinum with aromatic ligands, the emission properties are often affected by the extent of Pt···Pt and π-π contacts. [45] There exists a yellow and red polymorph of [PtCl 2 (2,2Ј-bipy)], [46] of {Tl[(C 4 H 9 N 4 )Pt(CN) 2 ]} n , [47] in other polymorphic forms a color difference of red (orange) Figure 6. Scatterplot for the C-H···Br angle vs. (C-)H···Br distance distribution from a CSD search.…”

Section: -Yellowmentioning

confidence: 99%

{2‐[1‐(2,6‐Diisopropylphenylimino)ethyl]pyridyl}palladium Dibromide Polymorphs Originating from Different Br···π and C–H···Br Contacts

Zhang

Tang

et al. 2008

Eur J Inorg Chem

View full text Add to dashboard Cite

Abstract{2‐[1‐(2,6‐Diisopropylphenylimino)ethyl]pyridyl}palladiumdibromide (1) was synthesized and crystallized as red crystals from chloroform in the monoclinic space group P21/c or as yellow crystals from methanol in the triclinic space group P$\bar {1}$. Other solvents, such as THF and acetonitrile, gave mixtures of red and yellow crystals. With very little conformational differences between the molecules in the dimorphs of 1 the crystal packing is a herringbone array in 1‐red and a parallel array in 1‐yellow, with the supramolecular interactions differing in the Br···π and C–H···Br contacts. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

show abstract

Origin of Polychromism of Cis Square-Planar Platinum(II) Complexes: Comparison of Two Forms of [Pt(2,2'-bpy)(Cl2]

Cited by 157 publications

References 0 publications

Single-stranded nucleic acid-induced helical self-assembly of alkynylplatinum(II) terpyridyl complexes

Single-stranded nucleic acid-induced helical self-assembly of alkynylplatinum(II) terpyridyl complexes

Characterization of excited electronic and vibronic states of platinum metal compounds with chelate ligands by highly frequency-resolved and time-resolved spectra

{2‐[1‐(2,6‐Diisopropylphenylimino)ethyl]pyridyl}palladium Dibromide Polymorphs Originating from Different Br···π and C–H···Br Contacts

Contact Info

Product

Resources

About