Single-molecule magnets(SMMs),which exhibit slow magnetic relaxation at low temperatures,attract extensive interests for their potential applications in the fields of high-density information storage,quantum computing and molecule spintronics1-3.The cobalt system is one of the most widely studied SMMs,as it not only has high ground state(S = 3/2),but also possesses high magnetic anisotropy4.Two cobalt complexes with similar structures were synthesized using quinoline-2-carboxylic acid(HL)as the ligand.Both complexes are six-coordinated in anti-triangular prism coordination geometries.There are one and four molecule units per cell for 1 and 2 with nearest Co-Co distances of 7.129 and 5.855(A),respectively,which lead to their intermolecular interactions zj' of-0.0018 cm-1 and-0.012 cm-1.