Crystal structures of two polymorphs for fac -bromidotricarbonyl[4-(4-methoxyphenyl)-2-(pyridin-2-yl)thiazole-κ 2 N , N ′]rhenium(I)

Crystallization of the title compound, fac -[ReBr(ppt-OMe)(CO) 3 ] (ppt-OMe = C 15 H 12 N 2 OS), from CH 2 Cl 2 / n -pentane (1:5 v / v ) at room temperature gave two polymorphs, which crystallize in monoclinic ( P 2 1 / c ; α form) and orthorhombic ( Pna 2 1 ; β form) space groups. The Re I complex molecules in either polymorph adopt a six-coordinate octahedral geometry with three facially -oriented carbonyl ligands, one bromido ligand, and two nitrogen atoms from one chelating ligand ppt-OMe. In the crystal, both polymorph α and β form di-periodic sheet-like architectures supported by multiple hydrogen bonds. In polymorph α, two types of hydrogen bonds (C—H...O) are found while, in polymorph β, four types of hydrogen bonds (C—H...O and C—H...Br) exist.