Examine the following species and determine the total number of distinct species in which the metal centre have 16 valence electrons. [Pt(C 2 H 4 )Cl 3 ] - , [Ir(CO)Cl(PPh 3 ) 2 ] , [Pt(PPh 3 ) 3 ] ,

Question

Examine the following species and determine the total number of distinct species in which the metal centre have 16 valence electrons.

[Pt(C₂H₄)Cl₃]^- , [Ir(CO)Cl(PPh₃)₂] , [Pt(PPh₃)₃] , Fe(CO)₅ , [Pt(NH )₆]⁴⁺ , [Ag(NH₃)₂]⁺ , [PdCl₄]^2- , [Co(CO)₃NO] , Ti(η¹-C₅H₅)₂(η⁵-C₅H₅)₂

TestHub · Accepted Answer

Count the valence electrons at each metal centre (ligand-electron method):

$[Pt (C_{2} H_{4}) Cl_{3}]^{-}$ : Pt(II) $d^{8}$ , 4-coordinate $\to 16 e^{-} ✓$

$[IrCl (CO) (PPh_{3})_{2}]$ : Ir(I) $d^{8}$ , 4-coordinate $\to 16 e^{-} ✓$

$[Pt (PPh_{3})_{3}]$ : Pt(0) $d^{10}$ , 3-coordinate $\to 16 e^{-} ✓$

$Fe (CO)_{5}$ : $8 + 10 = 18 e^{-} \times$

$[Pt (NH_{3})_{6}]^{4 +}$ : Pt(IV) $d^{6}$ , $6 + 12 = 18 e^{-} \times$

$[Ag (NH_{3})_{2}]^{+}$ : Ag(I) $d^{10}$ , $10 + 4 = 14 e^{-} \times$

$[PdCl_{4}]^{2 -}$ : Pd(II) $d^{8}$ , 4-coordinate $\to 16 e^{-} ✓$

$[Co (CO)_{3} NO]$ : $9 + 6 + 3$ (linear NO, 3e donor) $= 18 e^{-} \times$

$Ti (η^{1} - C_{5} H_{5})_{2} (η^{5} - C_{5} H_{5})_{2}$ : Ti(IV) $d^{0}$ , $2 \times 6 + 2 \times 2 = 16 e^{-} ✓$

Total number of 16-electron species = 5.

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