Syntheses and structures of two coordination polymers formed by Ni(cyclam)²⁺ cations and sulfate anions

The coordination polyhedra of the complex cations in the one-dimensional title coordination polymers represent tetra­gonally distorted trans-NiN₄O₂ octa­hedra with the four N atoms of the macrocyclic ligand forming the equatorial plane and two O atoms of the sulfate anions occupying the axial positions.

Synthesis, crystal structure and Hirshfeld surface analysis of [Sr(urea)(NO₃)₂]_n

The mol­ecular and crystal structure of the [Sr(urea)(NO₃)₂]_n complex was studied and Hirshfeld surfaces and fingerprint plots were generated to investigate the various inter­molecular inter­actions.

Crystal structure, Hirshfeld surface analysis and crystal voids of 4-nitro­benzo[c][1,2,5]selena­diazole

The title compound is almost planar. In the crystal, C—H⋯O hydrogen bonds link the mol­ecules into a network structure. There are also π–π inter­actions present with centroid-to-centroid distances of 3.746 (3) and 3.697 (3) Å.