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• Magneto-structural analyses of two coordination polymers based on Orotic acid are well explored. • Cu-orotate is first anionic, orotate based coordination polymer exhibit weak ferromagnetic behavior. • Ni-orotate coordination polymer becomes evidence for weak antiferromagnetic behavior. • DFT calculation underline the pathway of magnetic exchange interactions through N—H⋯O, O—H⋯O supramolecular synthons and confirm that the magnetic interactions propagate through such contacts in complex 1 and 2. Orotato based coordination network of formula [Cu(HOr) 2 2−. 2(CH 3) 2 ―NH 2 + n (1), and [Ni(HOr) . 3H 2 O] n (2), have been synthesized hydrothermally by self-assembly of orotic acid (H 3 Or) with metal salts Cu(OAc) 2 . H 2 O and Ni(NO 3) 2 • 6H 2 O respectively. Single crystal X-ray study confirms that in 1 electroneutrality is obtained with a compensating cation i.e. (CH 3) 2 ‒NH 2 + and trans-trans μ2η1:η1 bridging carboxylate extend the Cu-Orotate moiety into 2D coordination network showing square lattice topology (sql) which through { ... H‒N‒C = O} dimer yields into 3D hydrogen bonded coordination polymer.Temperature dependent measurements of magnetic susceptibility reveals the occurrence of competitive exchange interactions with weak ferromagnetic character in 1 (J = +0.31 cm–1) and weak antiferromagnetic interaction in 2 (J = - 0.52 cm–1). The dominantzero – field splitting effect is observed in Ni(II) ion. Two important magneticsuper exchange pathway transmitted through carboxylate oxygen of ligand through N‒H ... O, and O‒H ... O supramolecular synthons along with long Cu•••Cu separation of 6.635 Å (1) or Ni•••Ni separation of 7.700 Å (2). The DFT calculation analysis is used to rationalized the magnetic behavior in these coordination polymers. Image, graphical abstract [ABSTRACT FROM AUTHOR]