ORCID Profile
0000-0003-0620-228X
Current Organisation
University of Ruhuna Faculty of Science
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Publisher: Wiley
Date: 22-06-2016
Abstract: The syntheses of trans-[Ru(C≡C-1-C
Publisher: Wiley
Date: 31-10-2018
Abstract: Straightforward syntheses of bis[bis{1,2-bis(diphenylphosphino)ethane}ruthenium]-functionalized 1,3,5-triethynylbenzene-cored complexes via a methodology employing "steric control" permit facile formation of Y-shaped Sonogashira coupling products and distorted-H-shaped homo-coupled quadrupolar products. Cyclic voltammetric data from these products reveal two reversible metal alkynyl-localized oxidation processes for all complexes. The wavelengths of the linear optical absorption maxima are dominated by the nature of the peripheral alkynyl ligand rather than the substituent at the unique arm of the "Y" or at the quadrupolar complex "core". The quadratic optical nonlinearities of the Y-shaped complexes were assessed by the hyper-Rayleigh scattering technique at 800 nm and employing 100 fs light pulses introduction of donor NEt
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/CH16321
Abstract: The syntheses of octupolar alkynes 1,3,5-{4-(4-HC≡CC6H4-1-C≡C)-3,5-Et2C6H2-1-C≡C}3C6H3 (4) and 1,3,5-{4-(4-HC≡CC6H4-1-C≡C-4-C6H4-1-C≡C)-3,5-Et2C6H2-1-C≡C}3C6H3 (6), diphenylamino-substituted 1,3,5-(4-Ph2NC6H4-1-C≡C)3C6H3 (7), 1,3,5-(4-Ph2NC6H4-1-C≡C-4-C6H4-1-C≡C)3C6H3 (8), 1,3,5-{4-(4-Ph2NC6H4-1-C≡C-4-C6H4-1-C≡C)-3,5-Et2C6H2-1-C≡C}3C6H3 (9), and 1,3,5-{4-(4-Ph2NC6H4-1-C≡C-4-C6H4-1-C≡C-4-C6H4-1-C≡C)-3,5-Et2C6H2-1-C≡C}3C6H3 (10), and (N-heterocyclic carbene)gold-appended 1,3,5-{[(NHC-iPr)Au]C≡C}3C6H3 (11), 1,3,5-{[(NHC-iPr)Au]C≡C-4-C6H4-1-C≡C}3C6H3 (12), 1,3,5-{4-([(NHC-iPr)Au]C≡C-4-C6H4-1-C≡C)-3,5-Et2C6H2-1-C≡C}3C6H3 (13), and 1,3,5-{4-([(NHC-iPr)Au]C≡C-4-C6H4-1-C≡C-4-C6H4-1-C≡C)-3,5-Et2C6H2-1-C≡C}3C6H3 (14) [NHC-iPr = κC-cyclo-CN(2,6-C6H3iPr2)CH=CHN(2,6-C6H3iPr2)] are reported. The low-energy bands in the linear optical absorption spectra of all three sets of compounds are red-shifted and increase in intensity upon π-delocalizable ‘arm’ lengthening. The diphenylamino- and (NHC-iPr)gold-terminated compounds do not exhibit measurable second-harmonic generation as assessed by hyper-Rayleigh scattering at 1064 nm using nanosecond pulses. Computational studies have been employed to rationalize the optical properties of the new compounds. Calculations on 7–10 reveal that the lowest-energy transitions with large oscillator strengths are predominantly [Ph2NC6H4] (π) → [arms + core] (π*) in character, whereas calculations on 11–14 suggest that the low-energy transitions relate to the transfer of electron density from the Au-alkynyl core group to the terminal NHC groups.
Publisher: Wiley
Date: 09-05-2023
Abstract: Porphyrins are important macrocycles with applications in several areas including therapy, catalysis, and sensing. Strong nonlinear optical (NLO) responses are the key to fully exploiting the potential of these biocompatible molecules. We herein report that certain metal‐alkynyl donor/nitro acceptor‐functionalized porphyrins are attractive candidates for NLO applications. We show that specific ex les exhibit record quadratic optical nonlinearity, exceptional two‐photon absorption, and outstanding three‐photon absorption, and we report the first porphyrins that exhibit four‐photon absorption. The two‐, three‐, and four‐photon absorption maxima are found at the corresponding multiples of linear absorption bands that time‐dependent density functional theory assigns as admixtures of porphyrin‐localized π*←π and donor‐porphyrin to porphyrin‐acceptor charge‐transfer transitions.
Publisher: Wiley
Date: 18-04-2018
Abstract: The syntheses of oligo(p-phenylene ethynylene)s (OPEs) end-functionalized by a nitro acceptor group and with a ligated ruthenium unit at varying locations in the OPE chain, namely, trans-[Ru{(C≡C-1,4-C
Publisher: Wiley
Date: 09-05-2023
Abstract: Porphyrins are important macrocycles with applications in several areas including therapy, catalysis, and sensing. Strong nonlinear optical (NLO) responses are the key to fully exploiting the potential of these biocompatible molecules. We herein report that certain metal‐alkynyl donor/nitro acceptor‐functionalized porphyrins are attractive candidates for NLO applications. We show that specific ex les exhibit record quadratic optical nonlinearity, exceptional two‐photon absorption, and outstanding three‐photon absorption, and we report the first porphyrins that exhibit four‐photon absorption. The two‐, three‐, and four‐photon absorption maxima are found at the corresponding multiples of linear absorption bands that time‐dependent density functional theory assigns as admixtures of porphyrin‐localized π*←π and donor‐porphyrin to porphyrin‐acceptor charge‐transfer transitions.
Publisher: Wiley
Date: 19-07-2022
Abstract: Multi‐photon absorption (MPA) is of increasing interest for applications in technologically important “windows” of the electromagnetic spectrum (near‐infrared III, NIR‐III, 1550–1870 nm and the new 2080–2340 nm region) however, few molecules exist that display strong MPA at these long wavelengths. We herein report the syntheses of the first 2,5,8‐ s ‐heptazine‐cored organometallic complexes, together with organic analogues. The complexes exhibit outstanding 3PA cross‐sections in the NIR‐III and exceptional 4PA cross‐sections in the new 2080–2340 nm window. We demonstrate that replacing organic donor groups by organometallic units results in an order of magnitude increase in 3PA, the “switching on” of 4PA, and a dramatic improvement in photo‐stability. Our results highlight the impressive outcomes possible with an “organometalation” approach to NLO materials design.
Publisher: Wiley
Date: 17-06-2016
Abstract: The syntheses of oligo(p-phenylenevinylene)s (OPVs) end-functionalized with a ligated ruthenium alkynyl unit as a donor and a nitro as acceptor, namely trans-[Ru{C≡C-1-C
Publisher: Wiley
Date: 02-05-2018
Abstract: The performance of the CAM-B3LYP, ωB97X and LC-BLYP long-range corrected density functional theory methods in the calculation of molecular first hyperpolarizabilities (β) and low-lying charge transfer (CT) excitation energies of the metal alkynyl complexes M(C≡C-4-C
Publisher: Elsevier BV
Date: 07-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8DT00155C
Abstract: Optical nonlinearities increase from gold to nickel and then ruthenium complexes, and (for the gold complexes) on aryl bridge broadening.
Publisher: Wiley
Date: 27-06-2023
Publisher: Elsevier BV
Date: 11-2018
Publisher: Wiley
Date: 27-06-2023
No related grants have been discovered for Mahesh Kodikara.