摘要:
采用密度泛函理论中的杂化密度泛函B3LYP方法在赝势基组LANL2DZ水平上对OsnN0,±(n=1—6)团簇的各种可能构型进行了几何结构优化,得出了它们的基态构型,并对基态结构的磁学性质、自然键轨道(NBO)、光谱和芳香性进行了理论研究.研究结果表明:OsN-和Os5N-团簇发生了"磁矩猝灭"的现象,在Os2N和Os4N0,±团簇中Os原子与N原子之间属于反铁磁性耦合;团簇的NBO电荷分布取决于原子的相对位置,处于端点的N原子发生电荷转移要比处于中间的N原子明显;OsnN0,±(n=1—6)团簇的红外光谱和Raman光谱的各振动峰明显;Os5N-团簇的芳香性最强.
Abstract:
The possible geometrical and electronic structures of (OsnN)0,±(n=1—6) clusters are optimized by using the density functional theory (B3LYP) at the LANL2DZ level.For the ground state structures of (OsnN)0,±(n=1—6) clusters,The magnetic properties,the natural bond orbit (NBO),the spectrum and the aromatic characteristics are analyzed.The calculated results show that the magnetic moment of OsnN-cluster is quenched at n=1 and 5.Reversed ferromagnetic coupling between Os atom and N atom takes place in Os2N and Os4N0,± clusters.The NBO charge distribution of clusters depends on the relative position of the atom,for example,the charge transfer happening to N atoms in the endpoint is more obvious than that happening to the N atoms in the middle.There are obvious vibration peaks in IR and Raman spectra of (OsnN)0,±(n=1—6) clusters.The aromaticity of Os5N-cluster is the strongest.