Three new manganese(II) complexes, namely [Mn(NCS)2(L)2(CH3OH)2]·2CH3OH (1), [Mn(NCS)2(L)2(C2H5OH)2]·2C2H5OH (2) and [Mn(NCS)2(μ-L)2]n (3) (L = 4-acetylpyridine nicotinoylhydrazone) have been synthesized and characterized by elemental analysis, IR spectra, single-crystal and powder X-ray diffraction analysis. In order to investigate the effect of solvent, methanol, ethanol and acetonitrile have been used in the synthesis of complexes 1-3, respectively. When using methanol as solvent, complex 1 was obtained. Complex 2 was synthesized under the similar synthetic conditions of complex 1 using ethanol instead of methanol as a solvent. To further examine the effect of solvent on the structure, we used CH3CN as a solvent instead of the ethanol. Unlike the complexes 1 and 2, complex 3 was formed with 1D chain structure. The energetic features of the noncovalent interactions observed in the solid state of compounds 1 and 2 have been studied by means of DFT calculations.