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The optimized geometries of the complexes between HnY (n=2, 3; Y=O, S, N) and LiNH2 have been calculated at the B3LYP/6-311++G** and MP2/6-311++G** levels. Three stable complexes were obtained. Frequency analysis showed that the enlarged 2N―4Li presents the abnormal blue shift in three complexes. The calculated binding energy with basis set super-position error (BSSE) and zero-point vibrational energy (ZPE) corrections of complex I―III is _58.65, _31.66 and _69.59 kJ·mol-1 (MP2), respectively. Natural bond orbital theory (NBO) analysis has been performed, and the results revealed that the H2O…LiNH2 (complex I) and H3N…LiNH2 (complex III) are formed with coexisting σ-s and n-s type lithium bond interactions, complexⅡis formed with π-s type lithium bond interaction between HnY (n=2,3; Y=O, N) and LiNH2, and H2S…LiNH2 (complex II) is formed with n-s type lithium bond interaction between H2S and LiNH2. Natural resonance theory (NRT) and atom in molecule (AIM) theory have also been studied to investigate the bond order and topological properties of the lithium bond structures.
The optimized geometries of the complexes between HnY (n = 2, 3; Y = O, S, N) and LiNH2 have been calculated at the B3LYP / 6-311 ++ G ** and MP2 / 6-311 ++ G * Frequency analysis showed that the enlarged 2N-4Li presents the abnormal blue shift in three complexes. The calculated binding energy with basis set super-position error (BSSE) and zero-point vibrational energy (ZPE) Corrections of complex I-III is _58.65, _31.66 and _69.59 kJ · mol -1 (MP2), respectively. Natural bond orbital theory (NBO) analysis has been performed, and the results revealed that the H2O ... LiNH2 (complex I) and H3N ... LiNH2 (complex III) are formed with coxisting σ-s and ns type lithium bond interactions, complex Ⅱis formed with π-s type lithium bond interaction between HnY (n = 2, 3; ) and LiNH2, and H2S ... LiNH2 (complex II) is formed with ns type lithium bond interaction between H2S and LiNH2. Natural resonance theory (NRT) and atom in molecule (AIM) theory have als o studied to investigate the bond order and topological properties of the lithium bond structures.