Biomedical subjects
Publications and source records attributed to Kuan-Jiuh Lin.
A pi-pi scaffolding framework that was assembled as a one-dimensional chain structure comprising alternating Delta- and Lambda-iron(II) chiral building units, [Fe(II)(Delta)Fe(II)(Lambda)(ox)2(phen)2]n, reveals spontaneous magnetization that gives rise to pronounced hysteresis loops below 10 K.
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[reaction: see text] In contrast to the Diels-Alder reaction of fulvenes and various alkenes, 6-aminofulvenes react with maleic anhydride (or maleimide) to give [6 + 2] cycloaddition adducts, constituting an efficient and novel route to pentaleno[1,2-c]furan, pentaleno[1,2-c]pyrrole, and cyclopenta[a]pentalene skeleton.
A pi-stacked coordination solid, [[[(VO)2(OH)2(C4O4)(phen)2] x H2O]n] (1: phen = phenanthroline), was synthesized by hydrothermal methods and structurally characterized by X-ray single-crystal diffraction. The structure of 1 adopts a neutral open framework in which channeling apertures and windows are surrounded by four oxovanadyl dimers, two squarates, and two pairs of pi-pi interactions of phenanthroline groups; the dimensions of the windows are about 5.38 x 7.55 A along the c axis. Surprisingly, the porous framework with hydrophilic and hydrophobic characteristics was thermally stable up to 250 degrees C, as indicated from powder X-ray diffraction patterns and thermogravimetric analysis. Further investigation of lithium-ion intercalation into the channel matrix of 1 was conformed by 7Li NMR spectroscopy and cyclic votammetry measurements. The present case represents the first example of a porous coordination solid that possesses polar channels capable of mediating lithium-ion insertion.
The tetracyclic ring-fused, facially dissymmetric maleic anhydride 2 was synthesized from compound 9 obtained from the Diels-Alder cycloaddition of the bicyclic ring-fused cyclohexadiene 1 and acetylenedicarboxylate. Maleic anhydride 2 readily underwent the Diels-Alder cycloadditions with anthracene, 1,3-diphenylisobenzofuran, cyclopentadiene, 1,3-cyclohexadiene, 6,6-dimethylfulvene, and o-quinodimethane. All the cycloadditions occurred exclusively on the pi-face syn to the etheno bridge of 2, thereby in cases of the cycloadditions with anthracene, cyclopentadiene, 1,3-cyclohexadiene, and 6,6-dimethylfulvene producing the corresponding adducts 11a, 18b, 22b, and 23b that contain three double bonds aligned in parallel. The structures of 18b and 22b were unequivocally established by the X-ray structural determinations. The molecular structure of maleic anhydride 2 was analyzed by X-ray crystallography to have a pyramidalized dienophilic double bond, which appeared to correlate well with the observed pi-facial selectivity.