⚠️ trans-[Co(en)₂Cl₂]Cl — KONDUKTOMETRIYA CHEKLOVI!
trans-[Co(en)₂Cl₂]Cl — trans-bis(etilendiamin)dixlorokobalt(III) xlorid. Konduktometriya cis/trans ni farqlay olmaydi — ikkalasida ham Λm ≈ 250!
Muhim cheklov: cis-[Co(en)₂Cl₂]Cl ning Λm ham ≈ 250 S·cm²/mol. Konduktometriya cis/trans ni farqlay olmaydi! UV-Vis, IR yoki XRD kerak.
Farqlash usullari: UV-Vis (λmax cis: 535 nm, trans: 575 nm), IR (Co-Cl cho'qqilari: cis 330/310, trans 325), XRD (strukturaviy farq).
trans-[Co(en)2Cl2]Cl🔍 IQ
trans-Bis(etilendiamin)dixlorokobalt(III) xlorid
Trans-bis(etilendiamin)dixlorokobalt(III) xlorid (yashil)
M = 287.97 g/mol • CAS: 14878-43-8 (trans)
trans-[Co(en)₂Cl₂]Cl
287.97 g/moltrans-bis(etilendiamin)dixlorokobalt(III) xlorid — "Trans izomer (yashil)"
IQ spektri KBr tabletka usulida 4000−200 cm⁻¹ oralig'ida olingan. Eng muhim diagnostik signallar: ν(Co-Cl) 325 cm⁻¹ — 1 ta cho'qqi (trans izomer belgisi); ν(Co-N) 515 cm⁻¹ — Co-N bog'i. Bu kompleks cis/trans geometrik izomerizmning klassik namunasi.
🔬 Cis vs Trans izomerlar — konduktometriya cheklovi
⚠️ Muhim cheklov: Konduktometriya cis/trans ni farqlay olmaydi! Ikkalasida ham Λm ≈ 250 S·cm²/mol (1:1 elektrolit). Farqlash uchun UV-Vis, IR yoki XRD kerak.
Cis izomer (binafsha)
Trans izomer (yashil)
Farqlash usullari:
• UV-Vis: cis λmax = 535 nm, trans λmax = 575 nm
• IR: cis Co-Cl = 330, 310 cm⁻¹ (2 cho'qqi), trans = 325 cm⁻¹ (1 cho'qqi)
• XRD: strukturaviy farq (C₂ vs D₂ₕ simmetriya)
📈 Interaktiv IQ spektr grafigi (trans izomer)
Slayderni harakatlantirib, chastotani o'zgartiring. Eng yaqin cho'qqi avtomatik tanlanadi.
NH₂ ning deformatsion tebranishi.
📊 Cho'qqilar jadvali — trans izomer
| Chastota | T% | Belgilanish | Tavsif | Intensivlik | Bog' | Simmetriya |
|---|---|---|---|---|---|---|
| 3290 | 13% | νₐₛ(N-H) | N-H asimetrik cho'zilish | Juda kuchli | N-H | B₁ᵤ + B₂ᵤ + B₃ᵤ (D₂ₕ) |
| 3190 | 29% | νₛ(N-H) | N-H simmetrik cho'zilish | Kuchli | N-H | A_g (Raman) |
| 1585 | 47% | δ(NH₂) | NH₂ egilish (scissoring) | O'rta | NH₂ | B₁ᵤ + B₂ᵤ |
| 1048 | 59% | ν(C-N) | C-N cho'zilish (en ligand) | Kuchli | C-N | B₁ᵤ + B₂ᵤ |
| 665 | 51% | ρ(NH₂) | NH₂ rocking (tebranish) | O'rta | NH₂ | B₂ᵤ + B₃ᵤ |
| 515⭐ | 39% | ν(Co-N) | Co-N cho'zilish (NH₂) | Kuchli | Co-N | B₁ᵤ + B₂ᵤ |
| 325⭐ | 48% | ν(Co-Cl) | Co-Cl cho'zilish (trans) | Kuchli | Co-Cl | A₂ᵤ (D₂ₕ) |
| 285 | 69% | δ(Cl-Co-N) | Cl-Co-N egilish deformatsiya | O'rta-zaif | Cl-Co-N | B₁ᵤ + B₂ᵤ |
| 240 | 73% | δ(Co-Cl) | Co-Cl egilish (skeletal bending) | Zaif | Co-Cl | B₂ᵤ |
⭐ MUHIM: ν(Co-Cl) = 325 cm⁻¹ cho'qqisi TRANS izomer belgisi (1 ta cho'qqi, A₂ᵤ). Cis izomerda 330 va 310 cm⁻¹ (2 ta cho'qqi). Bu cis/trans farqlashning IQ belgisi!
⏱️ Aquation kinetikasi — cis/trans farqlash
Aquation — Cl⁻ ning H₂O bilan almashinishi. Trans izomer tezroq aquatsiyalanadi (t₁/₂ ≈ 5.5 soat, 25°C). Cis izomer sekinroq. Bu kinetik farqlash usuli!
Mexanizm: Dissotsiativ (D) yoki dissotsiativ almashinish (Id). Mahsulot: trans-[Co(en)₂(H₂O)Cl]²⁺ + Cl⁻. Rang o'zgarishi: yashil → och yashil.
⚖️ Werner koordinatsion qatori (Geary 1971 qiymatlari)
| Kompleks | Rang | Λm (S·cm²/mol) | Ionlar | Elektrolit |
|---|---|---|---|---|
| [Co(NH₃)₆]Cl₃ | sariq | 400-440 | 4 | 1:3 |
| [Co(NH₃)₅Cl]Cl₂ | binafsha | 230-260 | 3 | 1:2 |
| cis-[Co(en)₂Cl₂]Cl | binafsha | 240-260 | 2 | 1:1 |
| trans-[Co(en)₂Cl₂]Cl | yashil | 240-260 | 2 | 1:1 |
| [Co(en)₃]Cl₃ | sariq | 400-440 | 4 | 1:3 |
Muhim: trans-[Co(en)₂Cl₂]Cl ning Λm ≈ 240-260 S·cm²/mol — 1:1 elektrolit (2 ion). Manba: Geary, Coord. Chem. Rev. 7, 81 (1971).
🎨 Kristall maydon nazariyasi — CFSE hisoblagich
Elektron konfiguratsiya
CFSE hisoblagich
CFSE = -2.4×Δₒ + 2P • μ = √(n(n+2)) μB
🔬 Laboratoriya natijalari — turli sharoitlarda
| ID | Texnika | Sharoit | ν(NO₂) | ν(Co-Cl) | Sifat |
|---|---|---|---|---|---|
| LAB-001 | KBr tabletka | 200 mg KBr + 1 mg trans-izomer | — | 325 | A'lo |
| LAB-002 | KBr tabletka (cis) | 200 mg KBr + 1 mg cis-izomer | — | 330, 310 | A'lo |
| LAB-003 | ATR | To'g'ridan-to'g'ri kristall (trans) | — | 323 | A'lo |
| LAB-004 | Konduktometriya (suvda) | 10⁻³ M, 25°C | — | — | Farqlay olmaydi |
| LAB-005 | UV-Vis | Suvda, 10⁻⁴ M | — | — | Farqlash testi |
| LAB-006 | Aquation kinetikasi | 60°C, suvda | — | — | Kinetik test |
Trans izomer — Co-Cl faqat 1 ta cho'qqi (325 cm⁻¹, A₂ᵤ). Bu trans izomer belgisi.
⚠️ IQ tahliliga halaqit beruvchi omillar
| Manba | Chastota oralig'i | Ta'sir | Jiddiylik |
|---|---|---|---|
| Suv (H₂O) | 3400, 1640 cm⁻¹ | Keng cho'qqilar — N-H va NH₂ sohasiga aralashadi | Yuqori |
| Cis/trans aralashmasi | 330, 310 vs 325 cm⁻¹ | Cho'qqilar murakkablashadi — cis va trans cho'qqilari aralashadi | Yuqori |
| Aquation (suvda) | Barcha | Sekin aquation — Cl⁻ H₂O bilan almashinadi | O'rta |
| CO₂ (atmosfera) | 2350, 667 cm⁻¹ | O'tkir cho'qqilar — Co-Cl sohasiga aralashishi mumkin | O'rta |
| Nam KBr | 3400, 1640 cm⁻¹ | Keng suv cho'qqilari — spektrning ko'p qismini qoplaydi | Yuqori |
| Tableka qalinligi | Barcha | Juda qalin — cho'qqilar to'yingan. Juda yupqa — zaif signal. | O'rta |
KBr ni 110°C da 2 soat quritish. Namuna quritgichda saqlash.
🔬 Texnikalar solishtirishi
KBr tabletka
Namunani KBr bilan aralashtirib, gidravlik press bilan tabletka bosish
✓ Afzalliklar:
- • Eng aniq va an'anaviy usul
- • Co-Cl cho'qqilari aniq ko'rinadi
- • Cis/trans ni farqlash mumkin
- • Kvantitativ tahlil uchun qulay
✗ Kamchiliklar:
- • Namuna tayyorlash kerak (10-15 daq)
- • KBr nam bo'lsa, suv cho'qqilari aralashadi
- • Cis/trans aralashmasi aniq emas
- • Faqat bitta izomer uchun
✅ Asosiy xulosalar
- Trans izomer: D₂ₕ simmetriya, yashil rang, Λm ≈ 250 S·cm²/mol
- Konduktometriya cheklovi: cis izomer bilan deyarli bir xil Λm — farqlay olmaydi
- IR belgisi: Co-Cl cho'qqisi 325 cm⁻¹ (1 ta cho'qqi, A₂ᵤ)
- UV-Vis farqlash: trans λmax = 575 nm, cis = 535 nm
- Kinetik farqlash: trans tezroq aquatsiyalanadi (t₁/₂ ≈ 5.5 soat)
- Xelat effekti: en ligand barqarorlikni oshiradi
- Diamagnit: Co³⁺ d⁶, past spin