The title compound {Mo3 (μ3,-S) (μ-S)3 [μ-SOP (OEt )2] [S2P (OEt)2]3(CH3CN) }. CH3CN, C20H46,Mo3N2O9P4S11, Mr= 1222. 9, has been synthesized bythe reaction of [Mo3 (μ3,-S) (μ-S)3]4+ with Hdtp (hydrogen diethyldit...The title compound {Mo3 (μ3,-S) (μ-S)3 [μ-SOP (OEt )2] [S2P (OEt)2]3(CH3CN) }. CH3CN, C20H46,Mo3N2O9P4S11, Mr= 1222. 9, has been synthesized bythe reaction of [Mo3 (μ3,-S) (μ-S)3]4+ with Hdtp (hydrogen diethyldithiophosphate)and its structures was dctermined by X-ray crystallography. The crystal data for the title compound: triclinic, P1, Z= 2, a= 13. 011 (8), b= 13. 411 (9), c= 14. 385 (5)A, a=76. 59(5), B=78. 09(5), Y=82. 20(3), V= 2382(2) A3, Dc= 1.705 g/cm3, μ (MoKa) = 1. 434 mm-1, F (000) = 1228. The structure was refined to R =0.080 for 5485 observed reflections. Quasi-aromaticity in the puckered-ring of Mo3S3was experimentally probed by 31p NMR spectroscopic measurements. The 31p chemicalshifts of ligand DTP’s (diethyldithiophosphate) were modulated by the substituent effect of the adjacent bridging aromatic carboxylate through the long-distance super-conjugation via the trinuclear Mo cluster core.展开更多
round-the-clock solar observations with full-disk coverage of vector magnetograms and multi-wavelength images demonstrate that solar active regions(ARs) are ultimately connected with magnetic field. Often two or more ...round-the-clock solar observations with full-disk coverage of vector magnetograms and multi-wavelength images demonstrate that solar active regions(ARs) are ultimately connected with magnetic field. Often two or more ARs are clustered, creating a favorable magnetic environment for the onset of coronal mass ejections(CMEs). In this work, we describe a new type of magnetic complex: cluster of solar ARs. An AR cluster is referred to as the close connection of two or more ARs which are located in nearly the same latitude and a narrow span of longitude. We illustrate three examples of AR clusters, each of which has two ARs connected and formed a common dome of magnetic flux system. They are clusters of NOAA(i.e., National Oceanic and Atmospheric Administration) ARs 11226 & 11227, 11429 & 11430, and 11525 & 11524. In these AR clusters, CME initiations were often tied to the instability of the magnetic structures connecting two partner ARs, in the form of inter-connecting loops and/or channeling filaments between the two ARs. We show the evidence that, at least, some of the flare/CMEs in an AR cluster are not a phenomenon of a single AR, but the result of magnetic interaction in the whole AR cluster. The observations shed new light on understanding the mechanism(s) of solar activity. Instead of the simple bipolar topology as suggested by the so-called standard flare model, a multi-bipolar magnetic topology is more common to host the violent solar activity in solar atmosphere.展开更多
文摘The title compound {Mo3 (μ3,-S) (μ-S)3 [μ-SOP (OEt )2] [S2P (OEt)2]3(CH3CN) }. CH3CN, C20H46,Mo3N2O9P4S11, Mr= 1222. 9, has been synthesized bythe reaction of [Mo3 (μ3,-S) (μ-S)3]4+ with Hdtp (hydrogen diethyldithiophosphate)and its structures was dctermined by X-ray crystallography. The crystal data for the title compound: triclinic, P1, Z= 2, a= 13. 011 (8), b= 13. 411 (9), c= 14. 385 (5)A, a=76. 59(5), B=78. 09(5), Y=82. 20(3), V= 2382(2) A3, Dc= 1.705 g/cm3, μ (MoKa) = 1. 434 mm-1, F (000) = 1228. The structure was refined to R =0.080 for 5485 observed reflections. Quasi-aromaticity in the puckered-ring of Mo3S3was experimentally probed by 31p NMR spectroscopic measurements. The 31p chemicalshifts of ligand DTP’s (diethyldithiophosphate) were modulated by the substituent effect of the adjacent bridging aromatic carboxylate through the long-distance super-conjugation via the trinuclear Mo cluster core.
基金supported by the National Natural Science Foundation of China(Grant Nos.11221063,11373004,11322329,41404150,and 11303049)Ministry of Science and Technology(Grant No.2011CB811403)
文摘round-the-clock solar observations with full-disk coverage of vector magnetograms and multi-wavelength images demonstrate that solar active regions(ARs) are ultimately connected with magnetic field. Often two or more ARs are clustered, creating a favorable magnetic environment for the onset of coronal mass ejections(CMEs). In this work, we describe a new type of magnetic complex: cluster of solar ARs. An AR cluster is referred to as the close connection of two or more ARs which are located in nearly the same latitude and a narrow span of longitude. We illustrate three examples of AR clusters, each of which has two ARs connected and formed a common dome of magnetic flux system. They are clusters of NOAA(i.e., National Oceanic and Atmospheric Administration) ARs 11226 & 11227, 11429 & 11430, and 11525 & 11524. In these AR clusters, CME initiations were often tied to the instability of the magnetic structures connecting two partner ARs, in the form of inter-connecting loops and/or channeling filaments between the two ARs. We show the evidence that, at least, some of the flare/CMEs in an AR cluster are not a phenomenon of a single AR, but the result of magnetic interaction in the whole AR cluster. The observations shed new light on understanding the mechanism(s) of solar activity. Instead of the simple bipolar topology as suggested by the so-called standard flare model, a multi-bipolar magnetic topology is more common to host the violent solar activity in solar atmosphere.
