A novel
visible-light-driven organocatalytic protocol to access
aerobic oxidative cleavage of olefins, promoted by sodium benzene
sulfinate, is described herein. An array of alkenes smoothly delivered
the corresponding aldehydes and ketones under transition-metal-free
conditions. Notably, α-halo-substituted styrenes proceeded with
photoinduced oxidation to finally afford α-halo-acetophenones
with halogen migration. Crucial to this oxidation was the formation
of charge-transfer complexes between sodium benzene sulfinate with
molecular O2 to ultimately deliver the carbonyl products.
A manganese succinate having a layer structure in which the layers are pillared by the isonicotinate spacers in a 3D architecture exhibits long-range ferrimagnetic order below 5.0 K, with the ferrimagnetism arising, for topological reasons, from the nature of the carboxylate binding modes. The compound is the first structurally authenticated example of a 3D ferrimagnet, featuring a homometallic topological ferrimagnetic sheet among metal carboxylates.
The first structurally authenticated example of coordinated polymer featuring homometallic pillared-trilayer structure, [Co(3)(ina)(2)(pico)(2)(H(2)O)(2)](n) (1), was built from mixed pyridyl-type monocarboxylates, isonicotinate (ina) and 3-hydroxypicolinate (pico), containing Kagome-type [Co(3)(pico)(2)(H(2)O)(2)](n)(2n+) trilayers. The magnetic phase diagram of 1 shows a metamagnetic transition below 3.2 K, arising from the competing interactions between the antiferromagnetic intralayer couplings in different amplitudes with obviously noncompensated moments versus weak AF interlayer coupling.
A new pillared-layer coordination polymer, [Co(3)(pybz)(2)(pico)(2)](n) (1; pybz = 4-(pyridin-4-yl)benzoate, pico = 3-hydroxypicolinate), contains rare 2D [Co(3)(pico)(2)](n)(2n+) layers formed by linear cobalt(II) trimers through the unusual mu(4)-kappaN,O:kappaO'-mu(2):kappaO''-mu(2) bridging mode of pico ligands, which are further cross-pillared by exotridentate bridging pybz ligands to form a three-dimensional structure with an unusual uninodal 8-connected body-centered-cubic topology. The bulk magnetic behavior of 1 exhibits ferrimagnetic long-range ordering below 2.6 K, which mainly arises from the cooperative magnetic effect of the intra- and intertrimer arrangements in the 2D magnetic system based on the nature of the exchange modes of mu(2)-hydroxyl, mu(2)-carboxylate oxygen, and 1,1,3-mu(3)-carboxylate bridges.
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