Synthesis and electrochemical properties of new cobalt and manganese phthalocyanine complexes tetra-substituted with 3,4-(methylendioxy)-phenoxy
- Authors: Erdoğmuş, Ali , Akinbulu, Isaac Adebayo , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7234 , http://hdl.handle.net/10962/d1019672
- Description: The synthesis and electrochemical properties of new cobalt and manganese phthalocyanine complexes, tetra-substituted with 3,4-(methylendioxy)-phenoxy at the peripheral (complexes 3 and 5) and non-peripheral (complexes 4 and 6) positions, are reported. Complexes 3 and 4 showed Q-band absorption, in DMF, at 668 and 686 nm, respectively while Q-band due to complexes 5 and 6 appeared at 732 and 760 nm, respectively in CHCl3. All the complexes showed well resolved redox processes attributed to both metal and ring based processes. Complexes 3 and 4 showed four redox processes, labeled I, II, III and IV. For complex 3, process I (CoIPc−2/CoIPc−3) was observed at −1.45 V, II (CoIIPc−2/CoIPc−2) at −0.38 V, III (CoIIIPc−2/CoIIPc−2) at +0.49 V and IV (CoIIIPc−1/CoIIIPc−2) at +0.97 V versus Ag|AgCl. Similar processes were observed for complex 4 at −1.36 V, −0.27 V, +0.56 V, +1.03 V versus Ag|AgCl, respectively. Complexes 5 and 6 showed two redox processes (I and II). For complex 5, these processes appeared at −0.79 V (MnIIPc−2/MnIIPc−3, I) and −0.07 V versus Ag|AgCl (MnIIIPc−2/MnIIPc−2, II), while for complex 6, they were observed at −0.86 V and −0.04 V versus Ag|AgCl. Spectroelectrochemistry was used to probe and confirm the origin of these processes. , Original publication is availabe at http://dx.doi.org/10.1016/j.poly.2010.05.012
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Synthesis and photophysical properties of metal free, titanium, magnesium and zinc phthalocyanines.pdf
- Identifier: http://hdl.handle.net/10962/247023 , vital:51538
- Description: 2,3,9,10,16,17,23,24-Octakis(hexylthio)phthalocyanines (4a–6a) and 2-carboxy-9,10,16,17,23,24-hexakis(hexylthio)phthalocyanines (4b–6b) were synthesized using a one-pot method by cyclotetramerization of the phthalonitriles: 4,5-bis(hexylthio)phthalonitrile and carboxylic acid phthalonitrile. 2-Carboxycatecholato-2,3,9,10,16,17,23,24-octakis(hexylthio)phthalocyaninatotitanium(IV) (8) was prepared from 2,3,9,10,16,17,23,24-octakis(hexylthio)phthalocyaninatooxotitanium(IV) (7). The structures of these compounds were characterized by using elemental analyses, UV–Vis, FT-IR, 1H NMR and mass spectroscopies. Their photophysical properties were also studied. The ΦF values are 0.12, 0.02, 0.10, 0.06, 0.10, 0.06, 0.65, 0.80 and the ΦT values are 0.58, 0.56, 0.57, 0.64, 0.22, 0.48, 0.17, 0.12 for 4–8, respectively. The ΦF value for complex 8 is higher than ever reported for phthalocyanine complexes. The triplet lifetimes (τT) values for all the complexes were generally good, ranging from 50 to 310 μs, and generally increased in the presence of the single carboxyl group. These complexes showed reasonable triplet quantum yields and lifetimes, and hence have potential for use as photosensitizers in photodynamic therapy (PDT) of cancer.
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- Date Issued: 2011
Synthesis of zinc phthalocyanine derivatives with improved photophysicochemical properties in aqueous media
- Authors: Erdoğmuş, Ali , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7236 , http://hdl.handle.net/10962/d1019687
- Description: The synthesis, photophysical and photochemical properties of new peripherally (β) tetra-substituted thioquinoline Zn(II) (2) and quaternized thioquinoline Zn(II) phthalocyanines (3) and quaternized fluoro functional thiopyridine Zn(II) (5) are described for the first time. These complexes (2, 3 and 5) have been synthesized and characterized by elemental analysis, IR, 1H NMR spectroscopy and electronic spectroscopy. Complexes 2, 4 and 6have good solubility in organic solvents such as CHCl3, DCM, DMSO, DMF, THF and toluene and are not aggregated in all solvents (except for 2 in DMSO) within a wide concentration range. Complexes 3 and 5 showed very good solubility in water as well as DMSO and DMF. General trends are described for singlet oxygen, photodegradation, fluorescence quantum yields, triplet quantum yields and triplet life times of these complexes in DMSO (2, 4 and 6) and water (3 and 5). Complex 3 gave a very large triplet quantum yield in aqueous media (ΦT = 0.8 in water plus Triton X-100) and a reasonable triplet lifetime of 110 μs. Photophysical and photochemical properties of the phthalocyanines complexes 2–6 are very useful for PDT. , Original publication is available at http://dx.doi.org/10.1016/j.molstruc.2010.04.048
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Synthesis, characterization and photophysical properties of an acenaphthalene fused-ring-expanded NIR absorbing aza-BODIPY dye
- Authors: Majumdar, Poulomi , Mack, John , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7283 , http://hdl.handle.net/10962/d1020328
- Description: The synthesis and characterization of an NIR absorbing acenaphthalene fused-ring-expanded aza-BODIPY dye are reported. In contrast with its naphtho-fused analogue, a stable complex is obtained when the corresponding phthalonitrile is used as the precursor. A comparison is made with the photophysical properties of 3,5-diphenyl-aza-dibenzoBODIPY. , Original publication is available at http://dx.doi.org/10.1039/C5RA14916A , Arbortext Advanced Print Publisher 9.1.510/W Unicode , Acrobat Distiller 8.1.0 (Windows); modified using iText� 5.3.3 �2000-2012 1T3XT BVBA (AGPL-version)
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Synthesis, photophysical and nonlinear optical behavior of neodymium based trisphthalocyanine
- Authors: Sekhosana, Kutloano E , Amuhaya, Edith K , Khene, M Samson , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7243 , http://hdl.handle.net/10962/d1020247
- Description: Tris-{1(4),8(11),15(18),22(25)-tetra(4-tertbutylphenoxy) phthalocyaninato} dineodymium (III) was synthesised and its nonlinear optical and fluorescence behavior was studied. Low fluorescence quantum yield (ФF = 0.03) was obtained with a fluorescence lifetime τF = 4.31 ns for this complex. Nonlinear optical parameters for the complex were determined using the Z-scan technique and the values of Im[χ(3)] and γ were of the order of 10−10 and 10−28 esu, respectively. Square wave voltammetry revealed three reduction and two oxidation couples for the complex. , Original publication is available at http://dx.doi.org/10.1016/j.ica.2014.11.029
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Synthetic pathways to water-soluble phthalocyanines and close analogs
- Authors: Dumoulin, Fabienne , Durmus, Mahmut , Ahsen, Vefa , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7240 , http://hdl.handle.net/10962/d1019720
- Description: The different types of water-soluble phthalocyanines are presented and their synthesis is reviewed. , Original publication is available at http://dx.doi.org/10.1016/j.ccr.2010.05.002
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Tabarirevu woenda
- Authors: Tabarirevu Muyambo (Performer) , Tabarirevu Muyambo (Composer)
- Subjects: Personal lament , Indigenous folk music , Mbira dze chiNdau , Government offices , Chipinge , Southern Rhodesia (Zimbabwe)
- Type: Sound , Music
- Identifier: vital:15339 , MOA26-02 , http://hdl.handle.net/10962/d1017644 , MOA26
- Description: English translation of title: 'Tabarirevu is going' , Song of personal lament by Tabarirevu Muyambo with 3 mbira dze chiNdau , This recording is held at the International Library of African Music. For further information contact ilamlibrary@ru.ac.za , This recording was digitised by the International Library of African Music , Original format: 15ips reel , Equipment used in digitisation: Studer B 67 Tape Recorder; Nagra III , Software: Sound Forge V.6 , Sample rate: 44100Hz 16Bit Stereo
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Table Mountain in Cape Town 1874
- Subjects: Cape Town -- South Africa Gold Fields of South Africa Ltd. (South Africa) -- History -- Photographs Photographer -- Badcock, J.W.
- Type: Image
- Identifier: http://hdl.handle.net/10962/32857 , vital:24088 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/A 2889
- Description: Album of photographs by J.W. Badcock covering - (1) Cape Town - central, docks, gardens, Sea Point Station, Rondebosch; (2) Port Elizabeth - Bay, docks, central, Post Office, Wool stores, Humewood, Location (Russell Rd), Waterworks, Red House - regatta, rowing and boating activities, market, Cadle's Hotel, Cuyler Manor, St. George's Park, Kragga Kamma; (3) Uitenhage - view; (4) Kimberley and Diamond Fields - Kimberley Mine, Bultfontein, Wesselton Mine; (5) Alicedale - Railway station; (6) Grahamstown - view from Fort England area; (7) Camps Bay - view; (8) Graaff Reinet - E A Reed's store; (9) Madeira - views; (10) Cradock - church and views; (11) Ships - Catherine Scott, Albatross, Sedan, Garth Castle, Clara, R.M.S. Trojan, Tromp, Manx Queen, Doddington; (12) Black people - groups and huts, tribal dress; (13) Rivers - St John's Mouth, van Staden's (and drift), Gamtoos, (and ferry and hotel); (14) Cetywayo - port; (15) Bridges - Sunday's River, Little Fish River, Zwartkops Railway; (16) Railways - through Bushman's River Poort; (17) Wool washery - Van Staden's River; (18) Carts; (19) Betzhenger Farm - at Gamtoos River; (20) Bird Island - views and light house; (21) Valley of Desolation - views; (22) Meirings Poort; (23) Sterkfontein Caves. n.p., c. 1874 - c. 1891 , Gold Fields of South Africa Ltd. (donor)
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Table Mountain, Cape Town
- Subjects: Cape Town (South Africa) -- History -- Photographs
- Type: Image
- Identifier: http://hdl.handle.net/10962/17744 , vital:22276 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 2719_1
- Description: Album of "Photographs of South Africa", compiler and photographer not stated. Photos covering Easter and Western Cape, Natal, Free State, Rivers, Transport, Ostriches and Black people. [1880-1883] , Gold Fields of South Africa Ltd. (donor)
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Takala ri yo vhona dambi Takalani
- Authors: Kruger, Jaco (Recorded by) , Venda people (Performer) , Composer unknown
- Subjects: Takalani's homestead , Mukula , Thohoyandou -- Transvaal (Limpopo) -- South Africa , Transvaal (Limpopo) , South Africa , Indigenous music , Traditional music , Ngoma , Mirumba , Rattles , Clapping , Whistles , Drums , Dance song , Tshigombela dance
- Type: Music , Sound
- Identifier: vital:15785 , JKC02a-03 , http://hdl.handle.net/10962/d1008974 , Tape number: JKC02 , Original tape number: 2 , Track number: 03
- Description: English translation of title: 'Takalani we are going to see miracles' , Traditional Venda dance song accompanied by the mirumba, ngoma, whistling, phala-phala horn, ankle rattles and handclapping , For further details refer to Jaco Kruger recording card: 25
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Takalela vhudivhusi ha Venda ro takala
- Authors: Kruger, Jaco (Recorded by) , Venda people (Performer) , Composer unknown
- Subjects: Mathugana , Rembander , Transvaal (Limpopo) , South Africa , Indigenous music , Traditional Music , Ngoma , Mirumba , Rattles , Clapping , Phala-phala horn , Whistles , Drums , Tshigombela dance , Dance song
- Type: Music , Sound
- Identifier: vital:15786 , JKC01b-12 , http://hdl.handle.net/10962/d1008975 , Tape number: JKC01 , Original tape number: 1 , Track number: 12
- Description: English translation of title: 'Rejoice because Venda has become independant' , Traditional Venda dance song accompanied by the mirumba, ngoma, whistling, phala-phala horn, ankle rattles and handclapping , For further details refer to Jaco Kruger recording card: 15
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Taken from the Valley of Cry: the beloved country
- Subjects: Africans -- Social conditions South Africa -- Social conditions Indigenous peoples -- South Africa
- Type: Image
- Identifier: http://hdl.handle.net/10962/29683 , vital:23771 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 5165
- Description: A photograph of two women sitting on the rocks with a man standing
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Taking time to relax by a small stream
- Subjects: Rivers -- South Africa Human beings -- Social aspects
- Type: Image
- Identifier: http://hdl.handle.net/10962/39743 , vital:24917 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 5188
- Description: Photograph of people sitting next to the river
- Full Text: false
Talk to first year students
- Authors: Henderson, Derek Scott
- Subjects: Rhodes University
- Language: English
- Type: Text
- Identifier: vital:7347 , http://hdl.handle.net/10962/d1017076
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Talk to staff
- Authors: Henderson, Derek Scott
- Language: English
- Type: Text
- Identifier: vital:7396 , http://hdl.handle.net/10962/d1017285
- Full Text:
Tamba u tshi vhuya ngeno kubevha
- Authors: Kruger, Jaco (Recorded by) , Phophi, George (Performer) , Composer unknown
- Subjects: Malavuhe , Transvaal (Limpopo) , South Africa , Indigenous music , Traditional song , Dende , Braced gourd bow , Solo
- Type: Music , Sound
- Identifier: vital:15787 , JKC05b-05 , http://hdl.handle.net/10962/d1008976 , Tape number: JKC05 , Original tape number: 5 , Track number: 05
- Description: English translation of title: 'Play close to home little mouse' , Traditional Venda song accompanied by the dende braced gourd bow sung to children at dusk , For further details refer to Jaco Kruger recording card: 76
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Tamba utshi
- Authors: Kruger, Jaco (Recorded by) , Venda people (Performer) , Composer unknown
- Subjects: Ngudza , Transvaal (Limpopo) , South Africa , Indigenous music , Traditional music , Malende dance song , Drums
- Type: Music , Sound
- Identifier: vital:15792 , JKC10a-15 , http://hdl.handle.net/10962/d1008981 , Tape number: JKC10 , Original tape number: 10 , Track number: 15
- Description: English translation of title: 'Play closer to home small mouse' , Traditional Malende Venda dance song with drum accompaniment , For further details refer to Jaco Kruger recording card: 116
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Tamba utshi Part I
- Authors: Kruger, Jaco (Recorded by) , Lambani family (Performer) , Composer unknown
- Subjects: Halambani , Transvaal (Limpopo) , South Africa , Indigenous music , Traditional music , Xylophone , Instrumental
- Type: Music , Sound
- Identifier: vital:15788 , JKC15a-08 , http://hdl.handle.net/10962/d1008977 , Tape number: JKC15 , Original tape number: 15 , Track number: 08
- Description: Part I of traditional Venda tune with 21 key xylophone accompaniment , For further details refer to Jaco Kruger recording card: 163
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Tamba utshi Parts I, II, III and voices
- Authors: Kruger, Jaco (Recorded by) , Lambani family (Performer) , Composer unknown
- Subjects: Halambani , Transvaal (Limpopo) , South Africa , Indigenous music , Traditional song , Xylophone , Mbila
- Type: Music , Sound
- Identifier: vital:15789 , JKC15a-06 , http://hdl.handle.net/10962/d1008978 , Tape number: JKC15 , Original tape number: 15 , Track number: 06
- Description: Traditional Venda song with 21 key xylophone accompaniment , For further details refer to Jaco Kruger recording card: 163
- Full Text: false
Tamba utshi Parts II and III
- Authors: Kruger, Jaco (Recorded by) , Lambani family (Performer) , Composer unknown
- Subjects: Halambani , Transvaal (Limpopo) , South Africa , Indigenous music , Traditional music , Xylophone , Instrumental , One beater in each part
- Type: Music , Sound
- Identifier: vital:15791 , JKC15a-07 , http://hdl.handle.net/10962/d1008980 , Tape number: JKC15 , Original tape number: 15 , Track number: 07
- Description: Parts II and III of traditional Venda tune with 21 key xylophone accompaniment , For further details refer to Jaco Kruger recording card: 163
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