New donor-acceptor-donor (D-A-D)-type structures are widely used to design effective organic light-emitting diodes (OLEDs). In this communication, 4,7-bis(1,2,3,4,4a,9a-hexahydro-9H-carbazol-9-yl)-[1,2,5]oxadiazolo[3,4-d]pyridazine was obtained in a 65% yield by the treatment of 4,7-dichloro[1,2,5]oxadiazolo[3,4-d]pyridazine 1-oxide with 2,3,4,4a,9,9a-hexahydro-1H-carbazole. The structure newly...

In the title compound, C(17)H(20)ClFN(2)O(3), the dihedral angle between the pyridazine and benzene rings is 41.37 (10)°. In the crystal, there are no significant intermolecular interactions present. The terminal -CH(2)F group is disordered over two sets of sites with an occupancy ratio of 0.737 (2):0.263 (2).

In the title compound, C(17)H(20)Cl(2)N(4)O, the piperazine ring adopts a chair conformation and the dihedral angle between the pyridazine ring and the benzene ring is 36.3 (1)°. In the crystal, weak C-H⋯O and C-H⋯(N,N) inter-actions help to establish the packing, which also features short inter-molecular Cl⋯Cl contacts [3.331 (2) Å].

The synthesis and characterization of a unique (electro)chemiluminescent monomer based on a terthienyl system, and its corresponding polymer which is the first example of an electro-active chemiluminescent polymer bearing a pyridazine appendage, are described.

In the title compound, C(12)H(15)N(5), the piperidine ring adopts a chair conformation with the substituent C atom in an equatorial site and the dihedral angle between the pyridazine and pyrazole ring planes is 10.36 (2)°.

A compartmentalized {4 x[2 x 2]} Mn(II)16 antiferromagnetically coupled square grid results from the self-assembly reaction of a tetratopic pyridazine bis(hydrazone) ligand and Mn(II).

The asymmetric unit of the title compound, C(11)H(10)ClN(3)O, contains two geometrically different mol-ecules, A and B, in both of which the pyridazine rings are essentially planar with r.m.s. deviations of 0.0137 and 0.0056Å, respectively. In mol-ecule A, the dihedral angle between the pyridazine and benzene rings is 6.5 (2)°, whereas in mol-ecule B it is 27.93 (7)°. In mol-ecule B, an intramo...