The crystal structures of bis(3-fluoro-salicylaldoximato)nickel(II) and bis(3-methoxy-salicylaldoximato)nickel(II) have been determined at room temperature between ambient pressure and approximately 6 GPa. The principal effect of pressure is to reduce intermolecular contact distances. In the fluoro system molecules are stacked, and the Ni⋅⋅⋅Ni distance decreases from 3.19 Å at ambient pressure to 2.82 Å at 5.4 GPa. These data are similar to those observed in bis(dimethylglyoximato)nickel(II) over a similar pressure range, though contrary to that system, and in spite of their structural similarity, the salicyloximato does not become conducting at high pressure. Ni-ligand distances also shorten, on average by 0.017 and 0.011 Å for the fluoro and methoxy complexes, respectively. Bond compression is small if the bond in question is directed towards an interstitial void. A band at 620 nm, which occurs in the visible spectrum of each derivative, can be assigned to a transition to an antibonding molecular orbital based on the metal 3d(x(2)-y(2)) orbital. Time-dependent density functional theory calculations show that the energy of this orbital is sensitive to pressure, increasing in energy as the Ni-ligand distances are compressed, and consequently increasing the energy of the transition. The resulting blueshift of the UV-visible band leads to piezochromism, and crystals of both complexes, which are green at ambient pressure, become red at 5 GPa.
One thousand questionnaires were distributed to a random sample of Sydney pet owners in 1974 by a market research organisation. A response rate of 37.5% was obtained. Respondents were most likely to use a veterinary practice because it was conveniently located (27%), recommended by someone (22%),or they had been dissatisfied elsewhere (8%). The majority of pet owners preferred veterinary practices to be multiman (65%), unassociated with other services (61%), and run on an open clinic system (52%) with consultation hours between 6 pm and 8 pm on weekdays (45%), and 9 am and 11 am at weekends (about 50%). 91% had no preference regarding the sex of practitioner who treated their pet. 46% of cat owners and 25% of dog owners said that they would be unwilling to spend over +30 to save their pets life while 34% of cat owners and 55% of dog owners were willing to spend over $100. Professional competence and concern for animals were the qualities pet owners desired most in veterinary surgeons and veterinary practices. After these, pet owners rated prompt attention, 24 hour emergency service and modern professional equipment as the next most important features.
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