Reactions between the 1,3-bis(6-methylpyridin-2-yl) pyridine ligand L,C17H15N3 and LnIII(1a,1b,1c,1d) or a mixture of LnIII and CuII nitrates(2a,2b,2c,2d) resulted in a series of respectively novel mono-and heterodinuclea r complexes,where LnIII=Sm(a) ,Eu(b) ,Tb(c) ,Dy(d) . The compounds were char acterized by elemental analysis,ESI-MS and IR spectra,furthermore we obtained crystals of [H2L][Eu(NO3) 5](1b) and [CuL2][Eu(NO3) 5](2b) suitable for XRD char acterization. In the crystal structures the Eu ions are 10-coordinated with quit e a narrow range of Eu-O distances which are between 0.2436 and 0.2556 nm. In 1b the ligand molecule is protonated in both terminal rings,and the N-H groups ar e involved in the N-H…O hydrogen bonds with the same oxygen atom of one of the nitro groups. These hydrogen bonds connect the ions in 1b into the complex which is the principal building block of the structure. In 2b the [CuL2]2+ counterion s are present;the Cu is octahedrally coordinated by all nitrogen iatoms of two L molecules which are therefore almost perpendicular to each other. The electros tatic interactions between the charged species are in both cases the main drivin g force of the crystal packing. Reactions between the 1,3-bis (6-methylpyridin-2-yl) pyridine ligand L, C17H15N3 and LnIII (1a, 1b, 1c, 1d) or a mixture of LnIII and CuII nitrates (2a, 2b, 2c, 2d) resulted in a series of respectively novel mono- and heterodinuclear complexes, where LnIII = Sm (a), Eu (b), Tb (c), Dy (d). The compounds were char acterized by elemental analysis, ESI- MS and IR spectra of the obtained crystals of [H2L] [Eu (NO3) 5] (1b) and [CuL2] [Eu (NO3) 5] (2b) are suitable for XRD char acterization. -coordinated with quit ea narrow range of Eu-O distances which are between 0.2436 and 0.2556 nm. In 1b the ligand molecule is protonated in both terminal rings, and the NH groups ar e involved in the NH ... O hydrogen bonds with the same oxygen atom of one of the nitro groups. These hydrogen bonds connect the ions in 1b into the complex which is the principal building block of the structure. In 2b the [CuL2] 2+ counterions are are; the Cu is octahedrally coordinated by all nit rogen iatoms of two L molecules which are therefore almost perpendicular to each other. The electros tatic interactions between the charged species are in both cases the main drivin g force of the crystal packing.