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[Ni(CN)₄]²⁻ — UB-Vis spektri tahlili

tetrasiyanonikkolat(II) ioni • Kvadrat-planar d⁸ • d-d + MLCT

UB-Vis TahlilTekis kvadrat (D4h)d⁸Diamagnitd-d: Laporte-taqiqTermobarqaror, labil

[Ni(CN)₄]²⁻

162.78 g/mol

tetrasiyanonikkolat(II) ioni — d⁸ kvadrat-planar kompleks

UB-Vis spektrida kuchsiz d-d o'tish (420 nm, ε≈10) va kuchli MLCT (320 nm, ε≈1000) kuzatiladi. Ni²⁺ (d⁸) — kvadrat-planar geometriya (D4h). d-d o'tish Laporte-taqiqlangan (g→g) — ε juda kichik. MLCT: Ni²⁺ t₂g orbitallaridan CN⁻ π* orbitallariga zaryad ko'chishi. Termodinamik barqaror (log β₄≈30), lekin kinetik labil.

λmax (d-d)
420 nm
ε (d-d)
~10
ε (MLCT)
~1000
Rang
Sariq
Geometriya
Tekis kvadrat
Simmetriya
D4h
log β₄
≈30
μeff
0 (diamagnit)

📈 UB-Vis Spektri — [Ni(CN)₄]²⁻

Chizilmoqda...
0%

Grafik sxematik ko'rinish. d-d o'tish (420 nm) juda kuchsiz (ε≈10).

420 nmd-d (¹A₁g → ¹A₂g)
320 nmMLCT (Ni→CN π*)
265 nmπ→π* (CN⁻ ichki)

Eng muhim xususiyat: Kuchsiz d-d o'tish (ε≈10) — D₄h simmetriyada inversiya markazi bor, Laporte-taqiq. Kuchli MLCT (ε≈1000) UB sohada.

Asosiy xulosalar

  1. Kuchsiz d-d (420 nm, ε≈10) — Laporte-taqiq (D₄h)
  2. Kuchli MLCT (320 nm, ε≈1000) — UB sohada
  3. Sariq rang — binafsha nur yutilishi hisobiga
  4. Termodinamik barqaror (log β≈30), kinetik labil
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