() The transition metal compound [Ni(en)s]Cl2 absorbs energy at 3.2x109oules. Wh

Question

() The transition metal compound [Ni(en)s]Cl2 absorbs energy at 3.2x109oules. What color is this compound ? (g) By what two processes do Homo-sapiens "see" the color red? 30 pts) Complete the following table of geometries and corresponding hybridization's of the complex ions listed: Complex lon Coordination Number Geometry Hybridization of the Metal Atomic Orbitals [Ni(CN) Brel2 [CoCl4]2- Cr(C204)202OP square planar tetrahedral (18 pts) What is the oxidation number of the central metal in each of the following compounds: K2[Pb(EDTA)] Pt(NH)2Cl2 [Co(NHs)Br(en)2JBr2 Li2[Ni(CN) Br-] Ru(H-O(CO)sJSO

Explanation / Answer

Coordination number:

The number of atoms directly bonded to the metal atom in a complex is the coordination number of the complex.

[Ag(NH3)2]+   ----- 2

[Ni(CN)2Br2]2+   ----- 4

[CoCl4]2-   ------   4

[Cr(C2O4)2(H2O)2-]   ----- 6   [ Since C2O2-4 is bidentate ligand

According to this theory, the metal atom or ion under the influence of ligands can use its (n-1)d , ns, np or ns, np, nd orbitals for hybridisation to yield a set of equivalent orbitals of definite geometry such as octahedral,tetrahedral, square planar and so on.

These hybridised orbitals are allowed to overlap with ligand orbitals that can donate electron pairs for bonding.

                                Geomentry                Hybridization

[Ag(NH3)2]+              -----      Linear        -----        involvement of sp or sd(z2)

[Ni(CN)2Br2]2+        ----- Squar planar    -----          dsp2

[CoCl4]2-                  ----- Tetrahedral      -----          sp3

[Cr(C2O4)2(H2O)2-]   -----      Octahedral      -----        sp3 d2

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