Anion-induced contraction of helical receptors.
نویسندگان
چکیده
Uptake of a tetrafluoroborate anion into the centre of a dicopper bis-salicylaldoxime complex causes a major contraction of the cavity and an increase in helicity.
منابع مشابه
Effect of Subchronic Administration of Aqueous Artemisia annua Extract on a1-Adrenoceptor Agonist-Induced Contraction of Isolated Aorta in Rat
Artemisia species, growing in almost all the northern hemisphere, is used in folk medicine of some countries as a remedy for hypertension. Since some cardiovascular disorders including hypertension are accompanied with altered responsiveness of vascular alpha-adrenergic receptors, the effect of aqueous Artemisia annua extract (100 and 200 mg kg-1) on a1-adrenoceptor agonist-induced contraction ...
متن کاملEffect of imipramine and desipramine on adenosine receptors in isolated rat atria
The effect of different doses (1-50 µ M) of imipramine (IMI) and desipramine (DES) on the rate and force of contraction of isolated rat atria was studied. IMI and DES produced a dose-dependent increase in force of contraction (31- 94% for IMI and 35-118% for DES). Pretreatment of rats with reserpine (5 mg/kg) on the isolated atria with propranolol (1 µ g) inhibited the positive ionotropic eff...
متن کاملMechanism of histamine actions in human coronary arteries.
Helical strips of human coronary arteries contracted in response to histamine concentration dependently, they relaxed with low concentrations and contracted with high concentrations. Treatment with cimetidine potentiated contraction in the strips with intact and damaged endothelium to a similar extent and attenuated relaxation. Removal of endothelium abolished relaxation and potentiated contrac...
متن کاملFrom isolated 1H-pyrazole cryptand anion receptors to hybrid inorganic-organic 1D helical polymeric anion receptors.
We report a novel 1-D helical coordination polymer formed by protonated polyamine 1H-pyrazole cryptands interconnected by Cu(2+) metal ions that are able to encapsulate anionic species behaving as a multianion receptor. Switching from a monomeric receptor to a polymeric receptor is activated by metal ions and pH.
متن کاملIndolocarbazole-based anion receptors and molecular switches*
A number of indolocarbazole-based anion receptors were prepared and their anion-binding behaviors were characterized in solution and in the solid state. First, chainlength-dependent binding affinities of chloride ion were revealed using a series of indolo carbazoles that consisted of one to four indolocarbazole units. The binding affinities were steadily enhanced from monomer to dimer, then to ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Chemical communications
دوره 24 شماره
صفحات -
تاریخ انتشار 2009