Crystal structures of two polymorphs for fac-bromido-tricarbon-yl[4-(4-meth-oxy-phen-yl)-2-(pyridin-2-yl)thia-zole-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 (P2(1)/c; α form) and ortho-rhom-bic (Pna2(1); β form) space groups. The Re(I) complex mol-ecules in either polymorph adopt a six-coordinate octa-hedral geometry with three facially-oriented carbonyl ligands, one bromido ligand, and two nitro-gen 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.