The title compound is orthorhombic with space group Pnma and a 9.172(1), b 13.457(3), c 19.303(4) ? with d. (calcd.) = 1.42 for Z = 4. The structure was solved by heavy atom method and solved by least squares to R = 0.031. The crown ether does not coordinate directly with the Mn atom. The 4 water mols. and two thiocyanates from a cis distorted octahedral with Mn(II), and coordinate with 18-crown-6 through H-bonds.

Key words: CRYSTAL STRUCTURE DETERMINATION, X-RAY DIFFRACTION ANALYSIS, CROWN ETHER COMPOUNDS, AQUO COMPLEX, TRANSITION METAL COMPLEX, MANGANESE COMPLEX, THIOCYANATO COMPLEX