title: Metallacyclic platinum(II) bis(sulfonamides)

authors: Evans, Cameron

subjects: Platinum(II) complexes

abstract: A series of metallacyclic platinum(II) bis(sulfonamido) complexes have been synthesised by reaction of cis-[PtCl₂L₂] [L_PPh₃or L₂_1,5-cyclo-octadiene (cod)] with the sulfonamides [RSO₂NHCH₂CH₂NHSO₂R, RSO₂NHCH₂CHMeNHSO₂R or RSO₂NHC₆H₄NHSO₂R; R_Ph or p-C₆H₄Me] and Ag₂O. The products have been characterised by NMR spectroscopy, electrospray mass spectrometry, elemental analysis, and for the complexes [Pt{N(SO₂Ph)CH₂CH₂N(SO₂Ph)}(PPh₃)₂] and [Pt{N(SO₂Ph)C₆H₄N(SO₂Ph)}(cod)], by single-crystal X-ray structure determinations. In both of these complexes, one of the amido nitrogen atoms has the expected approximately planar geometry, but the other nitrogen atom is surprisingly distorted towards a tetrahedral geometry. The more pyramidal nitrogen has a higher trans-influence in the solid state, reflected by a shorter Pt_N bond, and longer cyclo-octadiene Pt_C bond length trans to this nitrogen.

text: Metallacyclic platinum(II) bis(sulfonamides) A series of metallacyclic platinum(II) bis(sulfonamido) complexes have been synthesised by reaction of cis-[PtCl₂L₂] [L_PPh₃or L₂_1,5-cyclo-octadiene (cod)] with the sulfonamides [RSO₂NHCH₂CH₂NHSO₂R, RSO₂NHCH₂CHMeNHSO₂R or RSO₂NHC₆H₄NHSO₂R; R_Ph or p-C₆H₄Me] and Ag₂O. The products have been characterised by NMR spectroscopy, electrospray mass spectrometry, elemental analysis, and for the complexes [Pt{N(SO₂Ph)CH₂CH₂N(SO₂Ph)}(PPh₃)₂] and [Pt{N(SO₂Ph)C₆H₄N(SO₂Ph)}(cod)], by single-crystal X-ray structure determinations. In both of these complexes, one of the amido nitrogen atoms has the expected approximately planar geometry, but the other nitrogen atom is surprisingly distorted towards a tetrahedral geometry. The more pyramidal nitrogen has a higher trans-influence in the solid state, reflected by a shorter Pt_N bond, and longer cyclo-octadiene Pt_C bond length trans to this nitrogen.

year: 2001-03-01

title: Just breathe: Dynamic breathwork as interoceptive exposure for veterans and police

authors: Pointer, Ben

subjects: breathwork

abstract: Military veterans and police officers experience high rates of trauma-related symptoms alongside autonomic dysregulation, yet many do not engage with or complete conventional therapies. Breathing-based interventions may provide a low-cost, acceptable alternative. I used a single-subject, multiple-baseline-across-participants design with eight veterans and police officers to evaluate a 10-session online dynamic breathwork protocol. I hypothesised that this intervention would (H1) increase resting heart rate variability (HRV) and reduce resting heart rate, (H2) improve self-reported psychological symptoms commonly associated with PTSD, and (H3) be rated as acceptable and feasible for home-based use. Participants practised cyclic hyperventilation, extended breath-holds, and a Valsalva-type manoeuvre in 10 sessions across a 20-day period. Resting heart rate variability (RMSSD) and heart rate were recorded daily with Polar® H10 sensors. Self-reported psychological measures of depression, anxiety, affect, mindfulness, and psychological flexibility were completed at baseline, post-intervention, and follow-up. Physiological outcomes did not show meaningful change. However, large effect sizes were observed across all psychological measures, with reductions in self-reported scores of depression, anxiety, and negative affect, and increases in mindful awareness and psychological flexibility. Social validity ratings indicated that the protocol was highly acceptable and feasible for home use. In contrast to traditional exposure therapies that target external trauma cues, this intervention employed breath-based interoceptive exposure to engage conditioned internal responses, offering a novel pathway for inhibitory learning. My results suggest that while short-term autonomic adaptation was not evident, structured online breathwork may offer a promising and scalable means of reducing psychological distress for trauma-exposed operational personnel.

text: Just breathe: Dynamic breathwork as interoceptive exposure for veterans and police Military veterans and police officers experience high rates of trauma-related symptoms alongside autonomic dysregulation, yet many do not engage with or complete conventional therapies. Breathing-based interventions may provide a low-cost, acceptable alternative. I used a single-subject, multiple-baseline-across-participants design with eight veterans and police officers to evaluate a 10-session online dynamic breathwork protocol. I hypothesised that this intervention would (H1) increase resting heart rate variability (HRV) and reduce resting heart rate, (H2) improve self-reported psychological symptoms commonly associated with PTSD, and (H3) be rated as acceptable and feasible for home-based use. Participants practised cyclic hyperventilation, extended breath-holds, and a Valsalva-type manoeuvre in 10 sessions across a 20-day period. Resting heart rate variability (RMSSD) and heart rate were recorded daily with Polar® H10 sensors. Self-reported psychological measures of depression, anxiety, affect, mindfulness, and psychological flexibility were completed at baseline, post-intervention, and follow-up. Physiological outcomes did not show meaningful change. However, large effect sizes were observed across all psychological measures, with reductions in self-reported scores of depression, anxiety, and negative affect, and increases in mindful awareness and psychological flexibility. Social validity ratings indicated that the protocol was highly acceptable and feasible for home use. In contrast to traditional exposure therapies that target external trauma cues, this intervention employed breath-based interoceptive exposure to engage conditioned internal responses, offering a novel pathway for inhibitory learning. My results suggest that while short-term autonomic adaptation was not evident, structured online breathwork may offer a promising and scalable means of reducing psychological distress for trauma-exposed operational personnel.

year: 2025

title: The cost of aquatic weed control in the Rotorua Te Arawa Lakes

authors: Champion, Paul

abstract: We will present information on the costs of aquatic weed control in the Rotorua, Te Arawa Lakes and thank all of the people who have willingly given us their estimated costs. Hopefully, this provides guidance on what current activities cost and what future scenarios might be feasible.

text: The cost of aquatic weed control in the Rotorua Te Arawa Lakes We will present information on the costs of aquatic weed control in the Rotorua, Te Arawa Lakes and thank all of the people who have willingly given us their estimated costs. Hopefully, this provides guidance on what current activities cost and what future scenarios might be feasible.

year: 2017