The complex [Cu(en) 2 (H 2 O)](sy) 2 (en)(H 2 O) 2 has been synthesized and characterized by its electronic and vibrational spectra. The molecular structure of the complex has been determined by X-ray diffraction methods. The complex crystallizes in the orthorhombic space group Pnma with unit-cell parameters a = 10.7236 (5), b = 20.4660(10), c = 14.4523(11)Å and Z = 4. In the cation, the Cu(II) ion has a distorted square pyramidal coordination with two bidendate (en) ligands forming the basal plane and a H 2 O molecule in the apical position. The complex cations and syringate anions constitute chains along the b axis in -A-B-A-fashion. The members of the chains are linked by through N-H···O hydrogen bonds. The (en) molecules are responsible for connecting adjacent layers.

Sanabria, Rosas and Carpintero [7] introduced the notions of Λ s I -sets and Λ s I -closed sets using ideals on topological spaces. Given an ideal I on a topological space (X, τ), a subset A ⊂ X is said to be I -cerrados usando ideales sobre espacios topológicos. Dado un ideal I sobre un espacio topológico (X, τ), un subconjunto A ⊂ X se llama Λ s I -cerrado si A = U ∩ F donde U es un Λ s I -conjunto y F es un conjunto τ ⋆ -cerrado . En este trabajo usamos conjuntos que son complementos de conjuntos Λ s I -cerrado, los cuales son llamados Λ s I -abiertos, para caracterizar nuevas variantes de continuidad, denominadas, funciones Λ s I -continuas y funciones Λ s I -irresolutas.