We provided the insight into the Gd-Pt bond by calculating NPA and AIM and revealed the electronic states using X-ray absorption near edge structure (XANES). These calculations will enable the role of metallic and organic ligands in the electronic and magnetic properties of Ln complexes to be further understood. The slow magnetization relaxation of the Gd complex was observed up to 45K, which is the highest temperature reported to date among isolated Gdcomplexes. In such a metallic ligand system, it is necessary to calculate the electronic state considering the influence of the orbital of the metal ion instead of treating the metal ion as a mere positive point charge. Further careful consideration for the effect of the heterometal bonds such as the complexes with higher covalency is required when discussing the magnetic properties of heterometallic bonded systems.