2,3-Dihydropyrazine C4H6N2 structure

C4H6N2 structure
Molecular Formula C4H6N2
Average mass 82.104 Da
Density 1.1±0.1 g/cm3
Boiling Point 148.4±23.0 °C at 760 mmHg
Flash Point 34.6±23.4 °C
Molar Refractivity 24.5±0.5 cm3
Polarizability 9.7±0.5 10-24cm3
Surface Tension 39.5±7.0 dyne/cm
Molar Volume 77.2±7.0 cm3

Predicted data is generated using the ACD/Labs Percepta Platform – PhysChem Module

Density: 1.1±0.1 g/cm3
Boiling Point: 148.4±23.0 °C at 760 mmHg
Vapour Pressure: 5.4±0.3 mmHg at 25°C
Enthalpy of Vaporization: 36.9±3.0 kJ/mol
Flash Point: 34.6±23.4 °C
Index of Refraction: 1.549
Molar Refractivity: 24.5±0.5 cm3
#H bond acceptors: 2
#H bond donors: 0
#Freely Rotating Bonds: 0
#Rule of 5 Violations: 0
ACD/LogP: -1.35
ACD/LogD (pH 5.5): -0.14
ACD/BCF (pH 5.5): 1.00
ACD/KOC (pH 5.5): 12.17
ACD/LogD (pH 7.4): 0.32
ACD/BCF (pH 7.4): 1.02
ACD/KOC (pH 7.4): 35.09
Polar Surface Area: 25 Å2
Polarizability: 9.7±0.5 10-24cm3
Surface Tension: 39.5±7.0 dyne/cm
Molar Volume: 77.2±7.0 cm3

Predicted data is generated using the US Environmental Protection Agency’s EPISuite™

 
 Log Octanol-Water Partition Coef (SRC):
 Log Kow (KOWWIN v1.67 estimate) = 1.93

 Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.42):
 Boiling Pt (deg C): 126.31 (Adapted Stein & Brown method)
 Melting Pt (deg C): -11.00 (Mean or Weighted MP)
 VP(mm Hg,25 deg C): 11.8 (Mean VP of Antoine & Grain methods)

 Water Solubility Estimate from Log Kow (WSKOW v1.41):
 Water Solubility at 25 deg C (mg/L): 2902
 log Kow used: 1.93 (estimated)
 no-melting pt equation used

 Water Sol Estimate from Fragments:
 Wat Sol (v1.01 est) = 2785.3 mg/L

 ECOSAR Class Program (ECOSAR v0.99h):
 Class(es) found:
 Neutral Organics

 Henrys Law Constant (25 deg C) [HENRYWIN v3.10]:
 Bond Method : 1.87E-004 atm-m3/mole
 Group Method: Incomplete
 Henrys LC [VP/WSol estimate using EPI values]: 4.393E-004 atm-m3/mole

 Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
 Log Kow used: 1.93 (KowWin est)
 Log Kaw used: -2.117 (HenryWin est)
 Log Koa (KOAWIN v1.10 estimate): 4.047
 Log Koa (experimental database): None

 Probability of Rapid Biodegradation (BIOWIN v4.10):
 Biowin1 (Linear Model) : 0.7085
 Biowin2 (Non-Linear Model) : 0.8633
 Expert Survey Biodegradation Results:
 Biowin3 (Ultimate Survey Model): 3.0177 (weeks )
 Biowin4 (Primary Survey Model) : 3.7293 (days-weeks )
 MITI Biodegradation Probability:
 Biowin5 (MITI Linear Model) : 0.5322
 Biowin6 (MITI Non-Linear Model): 0.5913
 Anaerobic Biodegradation Probability:
 Biowin7 (Anaerobic Linear Model): 0.6750
 Ready Biodegradability Prediction: YES

Hydrocarbon Biodegradation (BioHCwin v1.01):
 Structure incompatible with current estimation method!

 Sorption to aerosols (25 Dec C)[AEROWIN v1.00]:
 Vapor pressure (liquid/subcooled): 1.47E+003 Pa (11 mm Hg)
 Log Koa (Koawin est ): 4.047
 Kp (particle/gas partition coef. (m3/ug)):
 Mackay model : 2.05E-009 
 Octanol/air (Koa) model: 2.74E-009 
 Fraction sorbed to airborne particulates (phi):
 Junge-Pankow model : 7.39E-008 
 Mackay model : 1.64E-007 
 Octanol/air (Koa) model: 2.19E-007 

 Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
 Hydroxyl Radicals Reaction:
 OVERALL OH Rate Constant = 7.0700 E-12 cm3/molecule-sec
 Half-Life = 1.513 Days (12-hr day; 1.5E6 OH/cm3)
 Half-Life = 18.154 Hrs
 Ozone Reaction:
 No Ozone Reaction Estimation
 Fraction sorbed to airborne particulates (phi): 1.19E-007 (Junge,Mackay)
 Note: the sorbed fraction may be resistant to atmospheric oxidation

 Soil Adsorption Coefficient (PCKOCWIN v1.66):
 Koc : 165.5
 Log Koc: 2.219 

 Aqueous Base/Acid-Catalyzed Hydrolysis (25 deg C) [HYDROWIN v1.67]:
 Rate constants can NOT be estimated for this structure!

 Bioaccumulation Estimates from Log Kow (BCFWIN v2.17):
 Log BCF from regression-based method = 0.788 (BCF = 6.133)
 log Kow used: 1.93 (estimated)

 Volatilization from Water:
 Henry LC: 0.000187 atm-m3/mole (estimated by Bond SAR Method)
 Half-Life from Model River: 3.762 hours
 Half-Life from Model Lake : 117 hours (4.876 days)

 Removal In Wastewater Treatment:
 Total removal: 10.35 percent
 Total biodegradation: 0.09 percent
 Total sludge adsorption: 1.95 percent
 Total to Air: 8.31 percent
 (using 10000 hr Bio P,A,S)

 Level III Fugacity Model:
 Mass Amount Half-Life Emissions
 (percent) (hr) (kg/hr)
 Air 6.59 36.3 1000 
 Water 32.5 360 1000 
 Soil 60.8 720 1000 
 Sediment 0.107 3.24e+003 0 
 Persistence Time: 290 hr




 

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