BODIPY–subporphyrin hybrids bridged by a 1,4‐biphenylene or 1,4‐diphenylethynylene spacer were synthesized either by the palladium‐catalyzed Suzuki–Miyaura reaction or the Sonogashira reaction. Their structural and optical properties were examined with respect to the bridge and BODIPY structures. In all cases, intramolecular excitationenergy transfer from the subporphyrin core to the BODIPY peripheries is efficient. Depending on the presence or absence of β‐methyl groups adjacent to the meso position of the BODIPY subunit, the fluorescence is either increased or decreased. It was also found that the electronic interaction between the subporphyrin core and the meso‐(1,4‐phenylene) substituents causes spectral changes for the subporphyrin part, which is not observed for porphyrin counterparts.

Trinuclear manganese(III) complexes of new unsymmetrical pentadentate ligands, 6‐hydroxy‐2‐(2‐hydroxyphenyl)‐5‐(salicylideneamino)benzoxazole (H3L1) and 5‐(5,6‐benzosalicylideneamino)‐6‐hydroxy‐2‐(2‐hydroxynaphthyl)benzoxazole (H3L2), [Mn3(L1)3(CH3OH)3] (1) and [Mn3(L2)3(dmf)(CH3OH)(H2O)] (2) (dmf = N,N‐dimethylformamide), have been prepared. The structures of the ligands H3L1, H3L2 and complex 1 were determined by X‐ray crystallography, which revealed that the ligands have two distant chelating sites. The molecular structure of 1 is regarded as a tripodal pyramid with a cavity of about 3 Å diameter. Each MnIII ion is coordinated by ONO atoms from a tridentate Schiff base site and ON atoms from a benzoxazole site of two respective H3L1 ligands. The intramolecular Mn···Mn distances for 1 are in the range 8.0683–8.1791 Å, and the nearest intermolecular Mn···Mn distance, 5.7824(15) Å, is shorter than theintramolecular values. Magnetic measurements of 1 indicate that weak antiferromagnetic interactions (J = –0.2 cm–1, g = 2.0) are dominant in the trinuclear manganese(III) core. Cyclic voltammogram of 1 in dmf showed obscure redox couples assigned to two single‐electron transfer processes.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)

The title compound, [Co(C14H12NO2)2]NO3·H2O, is the first structurally characterized mononuclear complex of the mono­anionic tridentate N‐(2‐hydroxy­methyl­phen­yl)­salycylidene­iminate ligand. The Co atom has an octa­hedral environment formed by two ligands with meridional coordination.

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Self-assembly into polynuclear metal complexes can be achieved by the use of the multidentate ligands that possess the ability to bridge plural metal ions. 1-3 In our previous work, we reported on a trinuclear manganese (III) complex of 6-hydroxy-2-(2-hydroxyphenyl)-5-(salicylideneamino)benzoxazole (H3L), which was obtained by the reaction of a symmetrical ligand, 4,6-bis{(2-hydroxybenzylidene)imino}benzene-1,3-diol (H4L′), with manganese(II) acetate tetrahydrate. 4 The ligand H3L has an unsymmetrical structure comprised of ONO-tridentate and ON-bidentate coordination sites. It is expected that H3L can be utilized to obtain complex ligands, because two different coordination sites can bind to suitable metal ions. Here, we report on the crystal structure of the iron(III) complex, which has an unoccupied ON-coordination site.The precursor of H3L-Br (H4L′-Br·HCl) was synthesized from 4,6-diaminoresorcinol dihydrochloride (0.852 g, 4 mmol) and 5bromosalicylaldehyde (1.608 g, 8 mmol) in a similar manner as described in the literature. 4 H4L′-Br·HCl·2H2O (Yield: 1.41 g, 61%). C20H19Br2ClN2O6 (578.64): calcd. C 41.51, H 3.31, N 4.84; found C 41.27, H 3.23, N 4.91. To a solution of H4L′-Br·HCl (0.058 g, 0.1 mmol) in pyridine (10 cm 3 ) was added iron(III) chloride anhydrous (0.016 g, 0.1 mmol). The resulting light-brown solution was filtered. Dark-brown crystals were