Geometry Entities

D CAD is the most primitive CAD modeling technique. It only creates geometry entities (Ml a 2D plane. The basic 2D geometry entities are points, lines, arcs, circles, and splines. 2D CAD can only present the part model in a plane view. It is possible to use three plane views to describe a part. Commonly, the three plane views used are the top, front, and side views. 

Building and systems are modeled in accordance with this purpose. Geometry input may be established via CAD, elements then linked to database entities for properties, etc. 

The (/x3-X)Co3(CO)9 core, which has three tetrahedral Co(CO)3 units each bonded to a central entity in a trigonal array, is a common cluster geometry, as are analogs with Co substitution. A recent example of such a structure is via the reaction of Co2(CO)8 with (C6F5)2S, which yields (M3-S)Co3(C6F5)(CO)8.82... 

Spin relaxation in NMR is known to provide information about the dynamics of molecular entities and possibly about molecular geometry or electron distribution. Generally, dynamical information is obtained if the tensor of the relevant relaxation mechanism is known from independent determinations. Conversely, if parameters describing the dynamics of the considered molecule have been deduced beforehand, geometrical parameters may be derived. Only in particular situations, one can hope to access both types of parameters (dynamical and geometrical). For... 

The structure of [Fe(salten)(4-methyl-pyridine)]BPh4 has been determined at 293 K [194]. The Fe(III) ion is in a pseudo-octahedral environment in which the basal plane is formed by two salicylideneiminate entities (average Fe-0= 1.885 A, Fe-N= 1.987 A) oriented in trans geometry. The two axial positions are occupied by the secondary amine nitrogen atom of the di(3-aminopropyl) moiety of the ligand (Fe-N=2.035(7) A) and the nitrogen... 

The molecular structure of [(TIMEN )Co(N(p-PhOMe))] (3 -Co (N(p-PhOMe)), presented in Fig. 18, shows a pseudo-tetrahedral geometry featuring a short Co-Niinido bond (1.675 (2)A) 36). This short distance, together with an almost linear Co-N-C angle of 168.6(2)°, indicates strong multiple bond character within the Co-NAr entity. According to DFT studies, this bond is most accurately formulated as a double bond 36). 

Referring to or pertaining to a dependence of the properties of a molecular entity or a transition-state species in a particular electronic state on the relative nuclear geometry. Such effects are usually due to different geometrical arrangements. 

---