Unusual bridging of three nitrates with two bridgehead protons in an octaprotonated azacryptand.
نویسندگان
چکیده
Structural analysis of the nitrate complex of a thiophene-based azacryptand suggests that three nitrates are bridged with two bridgehead protons which play the topological role of two transition metal ions in a classical Werner type coordination complex bridging three anions.
منابع مشابه
Encapsulated chloride coordinating with two in-in protons of bridgehead amines in an octaprotonated azacryptand.
An encapsulated chloride in a thiophene-based cryptand is bridged by two in-in protons of tertiary amines with an N...Cl(-) distance of 3.048(3) A, similar to that observed in Park and Simmons' katapinand chloride complex.
متن کامل21-(4-Methylphenylsulfonyl)-4,7,13,16-tetraoxa-1,10,21-triazabicyclo[8.8.5]tricosane-19,23-dione: an N-tosylated macrobicyclic dilactam
The macrobicyclic title compound, C(23)H(35)N(3)O(8)S, contains two tertiary amide bridgehead N atoms and a toluene-sulfonamide N atom in the center of the five-atom bridging strand. The mol-ecule has a central cavity that is defined by the 18-membered ring identified by the N(2)O(4) donor atom set and two 15-membered rings with N(3)O(2) donor atom sets. The toluene-sulfonamide N atom adopts an...
متن کاملA 13C-NMR study of azacryptand complexes.
An azacryptand has been solubilised in aqueous media containing 50% (v/v) dimethyl sulphoxide. (13)C-NMR has been used to determine how the azacryptand is affected by zinc binding at pH 10. Using (13)C-NMR and (13)C-enriched bicarbonate we have been able to observe the formation of 4 different carbamate derivatives of the azacryptand at pH 10. The azacryptand was shown to solubilise zinc or cad...
متن کاملMultiple myocardial bridge in a 59 year-old woman
Introduction: Myocardial bridging is a congenital condition in which a segment of a major epicardial coronary artery has an intra myocardial route. Myocardial bridging is usually confined to a single vessel and is typically the mid segment of the left anterior descending artery. Bridging may be associated with chest pain, myocardial infarction, and sudden cardiac death, or usually asymptomati...
متن کاملThe unusual presentation of genital Crohn’s disease in a patient with breast cancer: A case report
Cutaneous Crohn’s disease (CCD) is a relatively rare disease. Two-thirds of the affected patients are female with a mean age of onset of 35 years. CCD is divided into a genital type and an extra-genital type, each with their own unique different clinical manifestations. The usual presentation of genital Crohn’s disease (CD) is in the form of erythema and edema of the labia and scrotum. Here, we...
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 46 3 شماره
صفحات -
تاریخ انتشار 2010