Control of pore window size is the standard approach for tuning gas selectivity in porous solids. Here, we present the first example where this is translated into a molecular porous liquid formed from organic cage molecules. Reduction of the cage window size by chemical synthesis switches the selectivity from Xe‐selective to CH4‐selective, which is understood using 129Xe, 1H, and pulsed‐field gradient NMR spectroscopy.
A reaction manifold has been discovered in which the chemoselectivity can be altered by switching between neat milling and liquid assisted grinding (LAG) with polar additives. After investigation of the reaction mechanism, it has been established that this switching in reaction pathway is due to the neat mechanochemical conditions exhibiting different kinetics for a key step in the transformation. This proof of concept study demonstrates that mechanochemistry can be used to trap the kinetic product of a reaction. It is envisaged that, if this concept can be successfully applied to other transformations, novel synthetic processes could be discovered and known reaction pathways perturbed or diverted.
Control of pore window size is the standard approach for tuning gas selectivity in porous solids. Here, we present the first example where this is translated into a molecular porous liquid formed from organic cage molecules. Reduction of the cage window size by chemical synthesis switches the selectivity from Xe‐selective to CH4‐selective, which is understood using 129Xe, 1H, and pulsed‐field gradient NMR spectroscopy.
PurposeThe purpose of this paper is to report on findings of follow‐up research into the performance of the Building and Construction Industry Security of Payment Act 1999 (NSW), which was undertaken in 2007. The research aims to re‐assess the performance of the Act in the light of strong demand for adjudication of construction payment claims in New South Wales.Design/methodology/approachA cross‐sectional survey of member firms of The Master Plumbers & Mechanical Contractors Association of NSW and the National Electrical & Communications Association (NSW Chapter) was undertaken using a comprehensive multiple‐choice questionnaire administered by post. The questionnaire comprised 23 questions, whereby all but one question was of a multiple‐choice type. In answering the questions, the sampled claimants were required to draw on their understanding of the Act, and their experience with the adjudication process. Results were compared with a pilot study undertaken by the authors in 2004.FindingsThe results indicate that the object of the Act is generally being achieved. Whilst the culture of making late payments remains well entrenched in the construction industry, there appears to be a modest downward trend in the frequency of late payments since the 2004 study. It is now reasonably certain that the act of endorsing payment claims encourages communication between the parties, thus providing an opportunity for early dispute avoidance or resolution. However, the level of knowledge of the Act amongst subcontracting organisations overall has not improved since 2004 study, and may have even declined. It is clear that contractors and subcontractors are not taking full advantage of the Act.Originality/valueThe paper provides evidence of the performance of the Building and Construction Industry Security of Payment Act 1999 (NSW) between 2004 and 2007. The research compares key performance indicators for the purpose of determining whether or not the Act produces the expected result of increasing security of payment, and whether the results are consistent with the reason for the Act. It also provides important insights into the operation of similar legislation in other jurisdictions.
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