The early Cambrian Chengjiang biota in Yunnan, southern China has yielded many articulated exoskeletons of the spiny redlichiid trilobite Eoredlichia intermedia, of which some have their appendages exceptionally well preserved. Both of the paired uniramous antennae of a medium-sized holaspis consist of 46–50 short segments (articles), each of which bears a fine spine near its inner edge. Behind the antennae there are twenty-one pairs of biramous limbs: three pairs are situated underneath the cephalon, one pair underneath each of the fifteen thoracic segments, and probably three pairs underneath the small pygidium. The endopod consists of a broad basis and seven podomeres, of which the last is divided into three terminal spines. The exopod is blade-like, and according to one interpretation, is dorsally hinged to the basis of the endopod; an alternative suggestion being that both the endopod and exopod are split from the basis, the latter being independent and not forming part of the endopod. The exopod has a prominent anterior rim, and possesses about forty long filaments along the posterior margin, and short setae along the rounded distal lobe. The basic appendage features of the redlichiid trilobites, and likewise the gut, are comparable to those of other known Cambrian polymerid trilobites that belong to more distantly related clades.
A novel NHC–Pd complex of 1,3‐bis (4‐ethoxycarbonylphenyl) imidazolium chloride has been synthesized and characterized by 1H NMR, 13C NMR, IR and X‐ray single‐crystal diffraction studies. TG analysis shows that the NHC‐Pd complex is stable under 208 °C. The catalytic activities have been explored for the synthesis of axially chiral N‐(2′‐methoxy‐1,1′‐binaphthalen‐2‐yl) benzophenone hydrazone. The result indicates that the novel NHC‐Pd complex can achieve better catalytic activity than the Pd‐phosphine catalysts in the synthesis of axially chiral N‐(2′‐methoxy‐1,1′‐binaphthalen‐2‐yl) benzophenone hydrazone.
Electrochemical CO 2 reduction (ECO 2 RR) is a promising way to convert CO 2 into valuable products, while requiring highly active and selective electrocatalysts. Herein, we synthesize a series of AgIn/In 2 O 3 catalysts with AgIn bimetallic core and In 2 O 3 shell structure for ECO 2 RR to produce formate. The AgIn bimetallic core improved the conductivity of the catalysts and the In 2 O 3 shell was reduced to In that served as active sites during the electrochemical reduction process. The activity and selectivity of formate production is related to the indium content in the AgIn/In 2 O 3 catalyst. The optimized Ag 50 In 50 @In 2 O 3 catalyst exhibited a high faradaic efficiency of 83 % at À 0.9 V and À 1.0 V vs. RHE for formate and the corresponding H 2 selectivity was largely suppressed to below 10 % of the applied potentials. There was no significant decay in current density and faraday efficiency of formate after 12 hours of stability testing. Density functional theory calculations indicated that the adsorption energy of *OCHO intermediate on the In shell was reduced due to the AgÀ In interface interaction and enhanced charge transfer compared with pure In surface, which lead to the increased selectivity of formate.
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