In chemistry, the Jemmis mno rules represent a unified rule for predicting and systematizing structures of compounds, usually clusters. The rules involve electron counting.

A generally applicable electron-counting rule the mno rule that integrates macropolyhedral boranes, metallaboranes, and metallocenes and any combination thereof is presented. According to this rule, m + n + o number of electron pairs are necessary for a

In chemistry the polyhedral skeletal electron pair theory (PSEPT) provides electron counting rules useful for predicting the structures of clusters such as borane and carborane clusters.

According to this rule, m + n + o number of electron pairs are necessary for a macropolyhedral system to be stable. Here, m is the number of polyhedra, n is the number of vertices, and o is the number of single-vertex-sharing condensations. For nido and arachno arrangements, one and two additional pairs of electrons are required.

2023年1月1日 · Jemmis' mno rules are remarkable in a way that they are applicable to simple polyhedra, metallocenes, and even unsaturated cyclic chemical compounds in addition to macropolyhedral clusters. The simplest example being B 20 H 16 where the SEP count of 22 {16(BH) + 4(B) = 16(2) + 3(4) = 44; SEP = 44/2 = 22} is exactly verified by mno formalism ( m ...

2014年5月30日 · An electron counting scheme for condensed polyhedral systems — the mno rule–made it possible to connect molecules to extended systems. According to the Jemmis mno rule, m + n + o electron pairs are needed for the stability of a macropolyhedral system.

A generalized electron-counting scheme, known as the mno rule, is applicable to a wide range of polycondensed polyhedral boranes and heteroboranes, metal -laboranes, metallocenes, and any of their combinations. According to this mno rule, the number of electron pairs N necessary for a

According to this rule, m + n + o number of electron pairs are necessary for a macropolyhedral system to be stable. Here, m is the number of polyhedra, n is the number of vertices, and o is the number of single-vertex-sharing condensations.

2024年9月28日 · Jemmis mno rules represent a unified rule for predicting and systematizing structures of compounds, usually clusters. The rules involve electron counting. They were formulated by Eluvathingal Devassy Jemmis to explain the structures of condensed polyhedral boranes such as B20H16, which are obtained

2010年8月13日 · The “mno rule” postulates that the number of occupied molecular orbitals, N, in a cluster with deltahedral geometry – such as a borane or carborane – is given by the sum of m, n, and o, where m is the number of polyhedra in the cluster, n is the number of vertices, and o is the number of single-vertex-sharing condensations.