In the title compound, C22H16Br2O2, which has approximate non-crystallographic inversion symmetry, the dihedral angles between the central ring and the pendant rings are 89.1 (4) and 82.4 (3)°; the dihedral angle between the pendant rings is 12.1 (4)°. In the crystal, the packing is influenced by van der Waals forces and no aromatic π-π stacking is observed.

In the title compound, C(22)H(10)N(4)O(2), the dihedral angles between the mean planes of the central benzene ring and the pendant rings are 79.20 (6) and 80.29 (6)°. The dihedral angle between the pendant rings is 10.27 (7)°.

In the title compound, C(27)H(17)N(3)O(4), the azo group displays a trans conformation and the dihedral angles between the central benzene ring and the pendant anthracene and nitro-benzene rings are 82.94 (7) and 7.30 (9)°, respectively. In the crystal structure, weak C-H⋯O hydrogen bonds, likely associated with a dipole moment present on the mol-ecule, help to consolidate the packing.

We report the chemical synthesis and some useful applications of N-(3-pyrene)maleimide which forms fluorescent adducts with organic compounds and proteins which contain sulfhydryl groups. Lifetime of the first excited singlet state of the small molecule adducts ranged from 1.4 to 6.5 ns. Fluorescence of the protein adducts exhibited two distinct lifetimes for each adduct. The longer component h...

In the racemic title compound, C20H16N2O5, the pyran ring adopts a shallow envelope conformation, with the stereogenic C atom displaced from the other atoms by 0.273 (2) Å. The dihedral angle between the fused-ring system and the pendant p-tolyl group is 87.62 (7)°. The mol-ecular conformation is consolidated by an intra-molecular N-H⋯O hydrogen bond, which generates an S(6) ring. In the crysta...

In the title compound, C(17)H(21)N(3)O(3)S, the dihedral angle between the aromatic ring planes is 84.2 (2)°. The pendant ethyl groups of the -N(C(2)H(5))(2) group are disordered over two sets of positions in a 0.84 (2):0.16 (2) ratio. The mol-ecular conformation is stabilized by an intra-molecular O-H⋯N hydrogen bond, and inter-molecular N-H⋯O bonds lead to [010] chains in the crystal structure.

In the title compound, C15H12FN3O2, the dihedral angles between the central benzene ring and the pendant benzene and oxa-diazole rings are 45.05 (13) and 15.60 (14)°, respectively. The C atom of the meth-oxy group is roughly coplanar with its attached ring [displacement = 0.178 (4) Å]. In the crystal, N-H⋯N hydrogen bonds link the mol-ecules into [010] chains. Weak C-H⋯π inter-actions are also ...

Two dysprosium complexes, [(C5H4Me)2Dy(L(1))] (3) and [(L(1))Dy(μ-Cl)3{Li(tmeda)}]2 (4), with amino-functionalized pentadienyl ligands L(1) are described. Crystallographic studies of 3 and 4 show that the pendant amino group influences the pentadienyl conformation and the ligand hapticity. Electronic structure calculations reveal that L(1) has a strong influence on the orientation of the main m...

In the title compound, C(39)H(26)O, the cyclo-penta-[a]acenaphthyl-ene skeleton displays the expected distortions, with formal sp(2) bond angles as high as C-C-C = 142.50 (10)°. The OH group forms inter-molecular hydrogen bonds via x-axis translation to the centroid (Cg) of the pendant phenyl ring of the biphenyl system, with H⋯Cg = 2.41 Å and O-H⋯Cg = 153°.

In the title compound, C(22)H(16)N(4)O(4)S, the dihedral angles between the pyrazole ring and the pendant aromatic rings are 26.2 (1), 41.1 (1) and 89.5 (1)°. In the crystal structure, an intermolecular C-H⋯N bond helps to establish the packing. A short C⋯C contact of 3.110 (12) Å is observed between the C atom of the pyrazole CH group and one of the α-C atoms of the 4-methyl-phenyl ring.