title: Heterobimetallic platinum–bismuth aggregates derived from [Pt₂(μ-S)₂(PPh₃)₄]

authors: Henderson, William

subjects: Platinum complexes

abstract: The metalloligand [Pt₂(μ-S)₂(PPh₃)₄] reacts with Bi(S₂CNEt₂)₃ or Bi(S₂COEt)₃ in methanol to produce the orange cationic adducts [Pt₂(μ-S)₂(PPh₃)₄Bi(S₂CNEt₂)₂]⁺ and [Pt₂(μ-S)₂(PPh₃)₄Bi(S₂COEt)₂]⁺, respectively, isolated as their hexafluorophosphate salts. An X-ray structure determination on [Pt₂(μ-S)₂(PPh₃)₄Bi(S₂CNEt₂)₂]PF₆ reveals the presence of a six-coordinated bismuth centre with an approximately nido-pentagonal bipyramidal coordination geometry. Fragmentation pathways for both complexes have been probed using electrospray ionisation mass spectrometry; ions [Pt₂(μ-S)₂(PPh₃)₂Bi(S₂CXEtn)₂]⁺ (X = O, n = 1, X = N, n = 2) are formed by selective loss of two PPh₃ ligands, and at higher cone voltages the species [(Ph₃P)PtS₂Bi]⁺ is observed. Ions formed by loss of CS₂ are also observed for the xanthate but not the dithiocarbamate ions.

text: Heterobimetallic platinum–bismuth aggregates derived from [Pt₂(μ-S)₂(PPh₃)₄] The metalloligand [Pt₂(μ-S)₂(PPh₃)₄] reacts with Bi(S₂CNEt₂)₃ or Bi(S₂COEt)₃ in methanol to produce the orange cationic adducts [Pt₂(μ-S)₂(PPh₃)₄Bi(S₂CNEt₂)₂]⁺ and [Pt₂(μ-S)₂(PPh₃)₄Bi(S₂COEt)₂]⁺, respectively, isolated as their hexafluorophosphate salts. An X-ray structure determination on [Pt₂(μ-S)₂(PPh₃)₄Bi(S₂CNEt₂)₂]PF₆ reveals the presence of a six-coordinated bismuth centre with an approximately nido-pentagonal bipyramidal coordination geometry. Fragmentation pathways for both complexes have been probed using electrospray ionisation mass spectrometry; ions [Pt₂(μ-S)₂(PPh₃)₂Bi(S₂CXEtn)₂]⁺ (X = O, n = 1, X = N, n = 2) are formed by selective loss of two PPh₃ ligands, and at higher cone voltages the species [(Ph₃P)PtS₂Bi]⁺ is observed. Ions formed by loss of CS₂ are also observed for the xanthate but not the dithiocarbamate ions.

year: 2006-01-01

title: Smart or Smarting: Student-library engagement in online distance education

authors: Ferrier-Watson, Anne

subjects: distance learning

abstract: This small-scale mixed methods study used surveys and focus groups to investigate the challenges faced by a cohort of online learners at the University of Waikato when seeking and referencing information for course assessments. The research also investigated the type of library support students value, as well as the barriers to their engagement with library information services. Findings revealed half the cohort reported they seldom used the library or library services during their degree; nearly three quarters of the cohort reported problems finding information; and over three quarters of the cohort did not seek help from the library. However, over three quarters of students reported they engaged with library referencing resources. This chapter makes observations about what it means to be ‘digitally smart’ in an academic library context, and suggests ways that library information services can be better provided and promoted to an information-saturated and time poor student audience.

text: Smart or Smarting: Student-library engagement in online distance education This small-scale mixed methods study used surveys and focus groups to investigate the challenges faced by a cohort of online learners at the University of Waikato when seeking and referencing information for course assessments. The research also investigated the type of library support students value, as well as the barriers to their engagement with library information services. Findings revealed half the cohort reported they seldom used the library or library services during their degree; nearly three quarters of the cohort reported problems finding information; and over three quarters of the cohort did not seek help from the library. However, over three quarters of students reported they engaged with library referencing resources. This chapter makes observations about what it means to be ‘digitally smart’ in an academic library context, and suggests ways that library information services can be better provided and promoted to an information-saturated and time poor student audience.

year: 2015

title: Ka Pū Te Ruha, Ka Hao Te Rangatahi: Maori identities in the twenty-first century

authors: Kukutai, Tahu

abstract: These social divides and problems are at the heart of this text.

text: Ka Pū Te Ruha, Ka Hao Te Rangatahi: Maori identities in the twenty-first century These social divides and problems are at the heart of this text.

year: 2017-02