Spectral peculiarities of NH-tautomerism in isocycle-containing porphyrins and their covalently linked dimers
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چکیده
منابع مشابه
Intra- and Intermolecular Singlet Fission in Covalently Linked Dimers
Electronic factors controlling singlet fission (SF) rates are investigated in four-chromophore model systems comprising two covalently linked dimers of tetracene. By using adiabatic framework and wave function analysis tools, we show that the lowest singlet multiexciton states are localized on the individual molecules. The intermolecular ME states, in which the triplet excitons reside on separa...
متن کاملOn couplings and excimers: lessons from studies of singlet fission in covalently linked tetracene dimers.
Electronic factors controlling singlet fission (SF) rates are investigated in covalently linked dimers of tetracene. Using covalent linkers, relative orientation of the individual chromophores can be controlled, maximizing the rates of SF. Structures with coplanar and staggered arrangements of tetracene moieties are considered. The electronic structure calculations and three-state kinetic model...
متن کاملCovalently linked dimers of clusters: loop- and dumbbell-shaped Mn24 and Mn26 single-molecule magnets.
Molecular clusters of paramagnetic 3d transition metals continue to be a major research area because of their fascinating physical properties and their complex structures. In particular, they often have high-spin ground states and easy-axis-type magnetic anisotropy, giving a significant energy barrier to reversal of the magnetization vector. Thus, at sufficiently low temperatures they function ...
متن کاملinvestigation of single-user and multi-user detection methods in mc-cdma systems and comparison of their performances
در این پایان نامه به بررسی روش های آشکارسازی در سیستم های mc-cdma می پردازیم. با توجه به ماهیت آشکارسازی در این سیستم ها، تکنیک های آشکارسازی را می توان به دو دسته ی اصلی تقسیم نمود: آشکارسازی سیگنال ارسالی یک کاربر مطلوب بدون در نظر گرفتن اطلاعاتی در مورد سایر کاربران تداخل کننده که از آن ها به عنوان آشکارساز های تک کاربره یاد می شود و همچنین آشکارسازی سیگنال ارسالی همه ی کاربران فعال موجود در...
Covalently linked zinc chlorophyll dimers as a model of a chlorophyllous pair in photosynthetic reaction centers.
A heterodimer, where zinc pyropheophorbide-a was linked with zinc pyropheophorbide-d through ethylene glycol diester, was prepared, as well as the corresponding homodimers. The synthetic dimers were complexed with methanol in benzene to give folded dimers by mutual Zn...O(Me)-H...O=C13(1) bonding. Such complexes had furthest red (Qy) absorption bands at longer wavelengths than the monomeric spe...
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ژورنال
عنوان ژورنال: Chemical Physics Letters
سال: 1984
ISSN: 0009-2614
DOI: 10.1016/0009-2614(84)85740-1