ABSTRACT
In China, most research on shore bugs (Hemiptera: Leptopodomorpha: Saldidae) has been conducted intermittently during the second half of the 19th century. Records from the literature supplemented by our collections were used to construct an annotated list of 50 species in 13 genera and 2 subfamilies (Chiloxanthinae and Saldinae) of Saldidae now known from China. This paper also presents new distributional records and color plates depicting 26 species. Further, a list of 12 species of Saldidae known in neighboring territories that might occur in China is presented.
Subject(s)
Heteroptera , Animals , China , ColorABSTRACT
A study of the scope and limitations of varying the ligand framework around the dinuclear core of FvRu2 in its function as a molecular solar thermal energy storage framework is presented. It includes DFT calculations probing the effect of substituents, other metals, and CO exchange for other ligands on ΔHstorage . Experimentally, the system is shown to be robust in as much as it tolerates a number of variations, except for the identity of the metal and certain substitution patterns. Failures include 1,1',3,3'-tetra-tert-butyl (4), 1,2,2',3'-tetraphenyl (9), diiron (28), diosmium (24), mixed iron-ruthenium (27), dimolybdenum (29), and ditungsten (30) derivatives. An extensive screen of potential catalysts for the thermal reversal identified AgNO3 -SiO2 as a good candidate, although catalyst decomposition remains a challenge.
Subject(s)
Alkadienes/chemistry , Coordination Complexes/chemical synthesis , Cyclopentanes/chemistry , Metals/chemistry , Solar Energy , Catalysis , Coordination Complexes/chemistry , Crystallography, X-Ray , Kinetics , Molecular Conformation , ThermodynamicsABSTRACT
In the northern and central part of Xinjiang (Western China) are distributed 14 species of coniferous plant bugs of these, 10 species are recorded for the first time for China. In the Mongolian Altai are 9 species: 6 widely distributed in the Palearctic, Deraeocoris annulipes (Herrich-Schaeffer, 1842), Dichrooscytus intermedius Reuter, 1885, Pinalitus rubricatus (Fallén, 1807), Atractotomus morio J. Sahlberg, 1883, Plagiognathus vitellinus (Scholtz, 1847), Phoenicocoris obscurellus (Fallén, 1829), and 3 Siberian Psallus (Pityopsallus) laricinus Vinokurov, 1998, P. (P.) laticeps Reuter, 1878, P. (P.) sachaensis Vinokurov, 1998. In Chinese Tian Shan and Jungar Alatau occur 5 mountain-Central Asian species: Dichrooscytus consorbinus Horváth, 1904, D. josifovi Kerzhner, 1997, D. kerzhneri Josifov, 1974 and D. pseudosabinae Reuter, 1896, and Compsidolon schrenkianum Konstantinov, Vinokurov, 2011. A key for 5 species of the subgenus Pithyopsallus Wagn. is given.
Subject(s)
Heteroptera/anatomy & histology , Heteroptera/classification , Animals , China , Ecosystem , Female , Male , TracheophytaABSTRACT
A foray into the exploration of Fe analogues of the (fulvalene)tetracarbonyldiruthenium [FvRu2(CO)4] solar-thermal storage system 1â2 is described. It was facilitated by the development of a convenient synthetic access to the parent [FvFe2(CO)4] 3a and the more soluble di(tert-butyl)fulvalene derivatives 3c and d. Laboratory time scale irradiations (>400 nm) fail to induce photoisomerization, an observation that is explained by the results of time-resolved IR experiments. They show that photoexcitation generates only the short-lived singlet syn biradical of 3 (and a small amount of decarbonylation product), in the absence of the corresponding triplet species required for the occurrence of rearrangement to 4.
Subject(s)
Electric Power Supplies , Iron/chemistry , Organometallic Compounds/chemistry , Ruthenium/chemistry , Solar Energy , Temperature , Molecular Conformation , Organometallic Compounds/chemical synthesis , Quantum Theory , Spectrophotometry, Infrared , Time FactorsABSTRACT
Caught in the light: The fulvalene diruthenium complex shown on the left side of the picture captures sun light, causing initial Ru-Ru bond rupture to furnish a long-lived triplet biradical of synâ configuration. This species requires thermal activation to reach a crossing point (middle) into the singlet manifold on route to its thermal storage isomer on the right through the antiâ biradical.
Subject(s)
Coordination Complexes/chemistry , Photosensitizing Agents/chemistry , Models, Molecular , Molecular Conformation , Oxidation-Reduction , Photochemical Processes , Spectrophotometry, Infrared , Time Factors , X-Ray Absorption SpectroscopyABSTRACT
The title compound, C(16)H(18)O(2)P(2), possesses two stereogenic P atoms and shows a distorted s-cis conformation of each O=P-C=C moiety. This has been suggested on the basis of the stereochemical result of 1,3-dipolar cyclo-additions with nitro-nes and is now confirmed by the present crystal structure analysis. There are two crystallographically independent molecules in the asymmetric unit.
ABSTRACT
The asymmetric 1,3-dipolar cycloaddition of the P-stereogenic dipolarophile (S(p),S(p))-6 to C,N-diphenylnitrone (7) led to previously unknown P-stereogenic isoxazolinyl diphosphine dioxides (R(p),S(p))-8 in enantio- and diastereomerically pure form; their stereospecific reduction with Ti(OiPr)(4)/PMHS proceeds in high yield with retention of configuration at the phosphorus atoms to give enantio- and diastereomerically pure diphosphines, which are conveniently purified via the corresponding diphosphine-diboranes.
