In intramolecular SF(iSF), the strong coupling nature and confinement of diffusional separation of ^1(TT) limits the extraction and harnessing of triplet energy. In order to investigate the possible ^1(TT) separation ...In intramolecular SF(iSF), the strong coupling nature and confinement of diffusional separation of ^1(TT) limits the extraction and harnessing of triplet energy. In order to investigate the possible ^1(TT) separation and the role of molecular parameters on it, a series of iSF-capable dibenzopentalene derivatives(DBPs) have been synthesized and their photoinduced dynamics are monitored. iSF takes place in DBPs, accompanied by consecutive ^1(TT) separation in polycrystalline film with almost ^100% yield. It is suggested the strong intermolecular coupling provided by the closely packing configuration in the film facilitates the disentanglement of correlated ^1(TT). Highly efficient triplet pair separation to yield free triplets makes one step forward for utilizing triplet energy from iSF materials for further optoelectronic applications.展开更多
A new approach to the research into the distribution of prime pairs is developed, attached with corollaries about the distribution of prime triplets and generally about that of prime h-tuplets. It differs from the usu...A new approach to the research into the distribution of prime pairs is developed, attached with corollaries about the distribution of prime triplets and generally about that of prime h-tuplets. It differs from the usual methods(involving the sieve method) for this kind of research, and bases on Chebyshev inequality and on the computation of average concentration of all the related subsets, and leads to the proofs of following lemma and theorem, attached with four corollaries:[Lemma 1] Among all the prime-pair-subsets there exists at least one such subset (namely one of the sets of generalized prime twins) which is an infinite set.[Theorem 1] All the prime-pair-subsets (namely all sets of generalized prime twins) or infinitely many prime-pair-subsets are infinite sets.[Corollary 1] Among all the prime-triplet-subsets there exists at least one such subset which is an infinite set.[Corollary 2] All the prime-triplet-subsets or infinitely many prime-triplet-subsets are infinite sets.[Corollary 3] Among all the prime-h-tuplet-subsets there exists at least one such subset which is an infinite set, where h is an arbitrary finite integer ≥2.[Corollary 4] All the prime-h-tuplet-subsets or infinitely many prime-h-tuplet-subsets are infinite sets, where h is an arbitrary finite integer ≥2.展开更多
The interaction of 2-methyl-1,4-naphthoquinone (MQ) with nucleotides and DNA have been studied using KrF laser photolysis aimed at elucidation of the initial reaction mechanism. Laser spectroscopy demonstrates directl...The interaction of 2-methyl-1,4-naphthoquinone (MQ) with nucleotides and DNA have been studied using KrF laser photolysis aimed at elucidation of the initial reaction mechanism. Laser spectroscopy demonstrates directly that the initial species from interaction of MQ with nucleotides are radical canons of nucleotides and MQ radical anion. Kinetic analysis indicates that formation of ion pair from interaction of any of mucleotides with MQ is synchronous with decay of triplet MQ, which has provided dynamic evidence for initiation of election transfer from DNA bases to triplet MQ, while the oxidation of TMP with slowest rate could be the rate determining step during the interaction of triplet MQ with DNA. Moreover direct observation of stabilized DNA guanyl radical canon from interaction of MQ with DNA has provided initial evidence for selective cleavage of DNA at guanine moiety, which has simulated the major, initial species produced by the action of ionizing radiation or UV light on DNA.展开更多
基金supported by the National Natural Science Foundation of China (21573251, 21833005)the National Basic Research Program of China (2017YFA0204503)+1 种基金the Beijing Natural Science Foundation of China (2162011)Project of State Key Laboratory on Integrated Optoelectronics of Jilin University (IOSKL2014KF16)
文摘In intramolecular SF(iSF), the strong coupling nature and confinement of diffusional separation of ^1(TT) limits the extraction and harnessing of triplet energy. In order to investigate the possible ^1(TT) separation and the role of molecular parameters on it, a series of iSF-capable dibenzopentalene derivatives(DBPs) have been synthesized and their photoinduced dynamics are monitored. iSF takes place in DBPs, accompanied by consecutive ^1(TT) separation in polycrystalline film with almost ^100% yield. It is suggested the strong intermolecular coupling provided by the closely packing configuration in the film facilitates the disentanglement of correlated ^1(TT). Highly efficient triplet pair separation to yield free triplets makes one step forward for utilizing triplet energy from iSF materials for further optoelectronic applications.
文摘A new approach to the research into the distribution of prime pairs is developed, attached with corollaries about the distribution of prime triplets and generally about that of prime h-tuplets. It differs from the usual methods(involving the sieve method) for this kind of research, and bases on Chebyshev inequality and on the computation of average concentration of all the related subsets, and leads to the proofs of following lemma and theorem, attached with four corollaries:[Lemma 1] Among all the prime-pair-subsets there exists at least one such subset (namely one of the sets of generalized prime twins) which is an infinite set.[Theorem 1] All the prime-pair-subsets (namely all sets of generalized prime twins) or infinitely many prime-pair-subsets are infinite sets.[Corollary 1] Among all the prime-triplet-subsets there exists at least one such subset which is an infinite set.[Corollary 2] All the prime-triplet-subsets or infinitely many prime-triplet-subsets are infinite sets.[Corollary 3] Among all the prime-h-tuplet-subsets there exists at least one such subset which is an infinite set, where h is an arbitrary finite integer ≥2.[Corollary 4] All the prime-h-tuplet-subsets or infinitely many prime-h-tuplet-subsets are infinite sets, where h is an arbitrary finite integer ≥2.
文摘The interaction of 2-methyl-1,4-naphthoquinone (MQ) with nucleotides and DNA have been studied using KrF laser photolysis aimed at elucidation of the initial reaction mechanism. Laser spectroscopy demonstrates directly that the initial species from interaction of MQ with nucleotides are radical canons of nucleotides and MQ radical anion. Kinetic analysis indicates that formation of ion pair from interaction of any of mucleotides with MQ is synchronous with decay of triplet MQ, which has provided dynamic evidence for initiation of election transfer from DNA bases to triplet MQ, while the oxidation of TMP with slowest rate could be the rate determining step during the interaction of triplet MQ with DNA. Moreover direct observation of stabilized DNA guanyl radical canon from interaction of MQ with DNA has provided initial evidence for selective cleavage of DNA at guanine moiety, which has simulated the major, initial species produced by the action of ionizing radiation or UV light on DNA.
