title: Syntheses and ligand interconversions of copper(II) derivatives of the metalloligand [Pt₂(µ-S)₂(PPh₃)₄]

authors: Devoy, Sarah M.

abstract: The reactivity of the metalloligand [Pt₂(µ-S)₂(PPh₃)₄] towards a variety of copper(II)–ligand systems has been studied. Reaction of [Pt₂(µ-S)₂(PPh₃)₄] with copper(II) halide complexes [CuCl₂L](L = 2,2 -bipyridine and 1,10-phenanthroline) gave trinuclear dicationic products [Pt₂(µ-S)₂(PPh₃)₄CuL]²⁺, and the 8-hydroxyquinolinate (hq) complex [Cu(hq)₂] gave [Pt₂(µ-S)₂(PPh₃)₄Cu(hq)]⁺, isolated as their BPh₄⁻ or PF₆⁻ salts. Related cationic complexes with other ancillary amine ligands (1,2-diaminoethane, 1,2-diaminopropane, 1,2-diaminocyclohexane) were obtained by reactions of [Pt₂(µ-S)₂(PPh₃)₄] with CuCl2 and the amine. In contrast, reaction of [Pt₂(µ-S)₂(PPh₃)₄] with CuCl₂ and NH₃ in methanol gave the intensely blue methoxy-bridged dicopper complex [{Pt₂(µ-S)₂(PPh₃)₄Cu(OMe)}₂]²⁺, isolated as its hexafluorophosphate salt. Copper β-diketonate complexes reacted with [Pt₂(µ-S)₂(PPh₃)₄] giving [Pt₂(µ-S)₂(PPh₃)₄Cu(β-diketonate)]⁺PF₆⁻ complexes, with the CH₃COCHCOCH₃(acac) and CF₃COCHCO(2-thienyl)(tta) derivatives characterised by X-ray structure determinations. The local Cu(II) environment ranges from distorted square-planar to an intermediate form of square-planar and tetrahedral. The β-diketonate derivatives show varying stability towards methanolysis, giving [{Pt₂(µ-S)₂(PPh₃)₄Cu(OMe)}₂]²⁺.

text: Syntheses and ligand interconversions of copper(II) derivatives of the metalloligand [Pt₂(µ-S)₂(PPh₃)₄] The reactivity of the metalloligand [Pt₂(µ-S)₂(PPh₃)₄] towards a variety of copper(II)–ligand systems has been studied. Reaction of [Pt₂(µ-S)₂(PPh₃)₄] with copper(II) halide complexes [CuCl₂L](L = 2,2 -bipyridine and 1,10-phenanthroline) gave trinuclear dicationic products [Pt₂(µ-S)₂(PPh₃)₄CuL]²⁺, and the 8-hydroxyquinolinate (hq) complex [Cu(hq)₂] gave [Pt₂(µ-S)₂(PPh₃)₄Cu(hq)]⁺, isolated as their BPh₄⁻ or PF₆⁻ salts. Related cationic complexes with other ancillary amine ligands (1,2-diaminoethane, 1,2-diaminopropane, 1,2-diaminocyclohexane) were obtained by reactions of [Pt₂(µ-S)₂(PPh₃)₄] with CuCl2 and the amine. In contrast, reaction of [Pt₂(µ-S)₂(PPh₃)₄] with CuCl₂ and NH₃ in methanol gave the intensely blue methoxy-bridged dicopper complex [{Pt₂(µ-S)₂(PPh₃)₄Cu(OMe)}₂]²⁺, isolated as its hexafluorophosphate salt. Copper β-diketonate complexes reacted with [Pt₂(µ-S)₂(PPh₃)₄] giving [Pt₂(µ-S)₂(PPh₃)₄Cu(β-diketonate)]⁺PF₆⁻ complexes, with the CH₃COCHCOCH₃(acac) and CF₃COCHCO(2-thienyl)(tta) derivatives characterised by X-ray structure determinations. The local Cu(II) environment ranges from distorted square-planar to an intermediate form of square-planar and tetrahedral. The β-diketonate derivatives show varying stability towards methanolysis, giving [{Pt₂(µ-S)₂(PPh₃)₄Cu(OMe)}₂]²⁺.

year: 2005-07-01

title: The environmental significance of natural nanoparticles

authors: Hartland, Adam

abstract: Natural water-borne nanoparticles are ubiquitous. Their very small size, ranging from 1 to 100 nanometers means they are both highly mobile and chemically reactive. Nanoparticles are central in buffering environmental systems, serving the dual role of limiting potentially toxic metal concentrations, while at the same time providing a supply of metals at levels that enables biochemical reactions to take place.

text: The environmental significance of natural nanoparticles Natural water-borne nanoparticles are ubiquitous. Their very small size, ranging from 1 to 100 nanometers means they are both highly mobile and chemically reactive. Nanoparticles are central in buffering environmental systems, serving the dual role of limiting potentially toxic metal concentrations, while at the same time providing a supply of metals at levels that enables biochemical reactions to take place.

year: 2013

title: Ko au tēnei

authors: Temara, Pou

subjects: Tuhinga auaha

abstract: He puha tēnei, he momo rotarota. E kōrero ana tēnei puha mō te pepeha o Tūhoe, arā, ko Maungapōhatu te maunga, ko Waikare te awa ko Tamakaimoana te hapu, ko Taiturakina rāua ko Pōhokorua ngā tāngata, ko Tūhoe te iwi.

Kua roa tēnei pepeha e mau ana i ngā kākahu Māori o nehe, ā, nō ngā rautau ki muri te tawhito o te pepeha nei. Kua mate noa atu te hunga nā rātau i waihanga. Ko rātau e mōhio ana ki te horopaki i titoa ai ā rātau pepeha. Taka iho ki nāianei kāore anō kia rerekē ngā kupu o te pepeha.

Engari kua rerekē te ao me tōna tai, he whakatipuranga hou kua hua ake hai noho i te whenua. He rerekē ōnā whakaaro, he rerekē te ahurea. Kua roa e noho tahi ana ēnei whakatipuranga me ngā iwi huhua o te ao, he rauiwi te ahurea. Kua whakatōria hoki te whakaaro o aua ahurea maha ki te hinengaro o te Māori. Kua riro ngā whakaaro i te ao whānui koia nei kai te tohutohu i te whakaaro o te Māori o ēnei rā.

Me pēhea te whakauru atu i te whakaaro o mohoā nei ki te whakaaro o ukiuki, kia whai tikanga ai ki te ngākau o nāianei ki te pepeha o mua? Kua tawhito o rātau kākahu. E hia ngā kaupapa, ngā pakanga, ngā kaikiritanga, ngā mamae i roto i taua wā. Kua tae ki te wā hai whakamautanga mā ō nāianei Māori i ngā kākahu o ēnei rā ki ngā pepeha o mua, kia whai wāhi ai ki te ahurea me te whakaaro o ēnei rā.

Ehara i te mea me whakaae te iwi katoa ki ngā whakaaro kua tāpiritia ki te pepeha nei. Engari hai aha mā wai? Ko te rotarota he kupu nā te kaitito, he kupu motuhenga nō tōna ngākau, hai tohu i tāna titiro ki te ao, ā, kia uru atu ai ia ki te ao me ngā whakaaro o mua.

text: Ko au tēnei He puha tēnei, he momo rotarota. E kōrero ana tēnei puha mō te pepeha o Tūhoe, arā, ko Maungapōhatu te maunga, ko Waikare te awa ko Tamakaimoana te hapu, ko Taiturakina rāua ko Pōhokorua ngā tāngata, ko Tūhoe te iwi.

Kua roa tēnei pepeha e mau ana i ngā kākahu Māori o nehe, ā, nō ngā rautau ki muri te tawhito o te pepeha nei. Kua mate noa atu te hunga nā rātau i waihanga. Ko rātau e mōhio ana ki te horopaki i titoa ai ā rātau pepeha. Taka iho ki nāianei kāore anō kia rerekē ngā kupu o te pepeha.

Engari kua rerekē te ao me tōna tai, he whakatipuranga hou kua hua ake hai noho i te whenua. He rerekē ōnā whakaaro, he rerekē te ahurea. Kua roa e noho tahi ana ēnei whakatipuranga me ngā iwi huhua o te ao, he rauiwi te ahurea. Kua whakatōria hoki te whakaaro o aua ahurea maha ki te hinengaro o te Māori. Kua riro ngā whakaaro i te ao whānui koia nei kai te tohutohu i te whakaaro o te Māori o ēnei rā.

Me pēhea te whakauru atu i te whakaaro o mohoā nei ki te whakaaro o ukiuki, kia whai tikanga ai ki te ngākau o nāianei ki te pepeha o mua? Kua tawhito o rātau kākahu. E hia ngā kaupapa, ngā pakanga, ngā kaikiritanga, ngā mamae i roto i taua wā. Kua tae ki te wā hai whakamautanga mā ō nāianei Māori i ngā kākahu o ēnei rā ki ngā pepeha o mua, kia whai wāhi ai ki te ahurea me te whakaaro o ēnei rā.

Ehara i te mea me whakaae te iwi katoa ki ngā whakaaro kua tāpiritia ki te pepeha nei. Engari hai aha mā wai? Ko te rotarota he kupu nā te kaitito, he kupu motuhenga nō tōna ngākau, hai tohu i tāna titiro ki te ao, ā, kia uru atu ai ia ki te ao me ngā whakaaro o mua.

year: 2017