An azido-bridged chair-like decanuclear cluster: [Co(II)10(bzp)8(Metz)2(N3)18]·4MeOH·3H2O (1, bzp = 2-benzoylpyridine and HMetz = 5-methyl-1H-tetrazole) was prepared with in situ tetrazolate anions as templates in a sealed system. 1 containing both octahedral and tetrahedral Co(II) ions exhibited slow relaxation of magnetization with an effective barrier of 26 K under an applied dc field of 1 kOe.

A series of novel mononuclear iron(III) complexes [Fe(saldpt)(atz)] (1) and [Fe(Rsalpet)(atz)] (2a-d) involving 5-aminotetrazole (Hatz) and pentadentate Schiff base ligands (H2saldpt = N,N'-bis(2-hydroxybenzyliden)-1,7-diamino-4-azaheptane, H2salpet = N,N'-bis(2-hydroxybenzyliden)-1,6-diamino-3-azahexane, H25Cl-salpet = N,N'-bis(5-chloro-2-hydroxybenzylidene)-1,6-diamino-3-azahexane, H25Br-salp...

The structure, energetics, and aromaticity of c.a. 100 constitutional isomers tautomers pyrido[m,n]diazepines (m = 1, 2; n 2, 3, 4, 5; m ≠ n) were studied at the B3LYP/cc-pVTZ level. pyrido[1,3]diazepines appear most, while pyrido[2,4]diazepines are least stable (ca. 26 kcal/mol). In pyrido[1,n]diazepine group (n 2–5), [1,5] higher in energy by ca. 4.5 kcal/mol [1,4] ones 7 kcal/mol, pyrido[1,2...