2,5-Diketopiperazine C4H6N2O2 structure

C4H6N2O2 structure
Molecular Formula C4H6N2O2
Average mass 114.103 Da
Density 1.2±0.1 g/cm3
Boiling Point 573.7±43.0 °C at 760 mmHg
Flash Point 301.9±28.3 °C
Molar Refractivity 25.4±0.3 cm3
Polarizability 10.1±0.5 10-24cm3
Surface Tension 38.1±3.0 dyne/cm
Molar Volume 91.5±3.0 cm3

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

Density: 1.2±0.1 g/cm3
Boiling Point: 573.7±43.0 °C at 760 mmHg
Vapour Pressure: 0.0±1.6 mmHg at 25°C
Enthalpy of Vaporization: 86.0±3.0 kJ/mol
Flash Point: 301.9±28.3 °C
Index of Refraction: 1.467
Molar Refractivity: 25.4±0.3 cm3
#H bond acceptors: 4
#H bond donors: 2
#Freely Rotating Bonds: 0
#Rule of 5 Violations: 0
ACD/LogP: -2.56
ACD/LogD (pH 5.5): -1.94
ACD/BCF (pH 5.5): 1.00
ACD/KOC (pH 5.5): 2.11
ACD/LogD (pH 7.4): -1.94
ACD/BCF (pH 7.4): 1.00
ACD/KOC (pH 7.4): 2.11
Polar Surface Area: 58 Å2
Polarizability: 10.1±0.5 10-24cm3
Surface Tension: 38.1±3.0 dyne/cm
Molar Volume: 91.5±3.0 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) = -2.83

 Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.42):
 Boiling Pt (deg C): 365.66 (Adapted Stein & Brown method)
 Melting Pt (deg C): 148.85 (Mean or Weighted MP)
 VP(mm Hg,25 deg C): 3.35E-008 (Modified Grain method)
 MP (exp database): 312 dec deg C
 Subcooled liquid VP: 5.59E-005 mm Hg (25 deg C, Mod-Grain method)

 Water Solubility Estimate from Log Kow (WSKOW v1.41):
 Water Solubility at 25 deg C (mg/L): 1e+006
 log Kow used: -2.83 (estimated)
 no-melting pt equation used
 Water Sol (Exper. database match) = 1.68e+004 mg/L (25 deg C)
 Exper. Ref: YALKOWSKY,SH & DANNENFELSER,RM (1992)

 Water Sol Estimate from Fragments:
 Wat Sol (v1.01 est) = 1e+006 mg/L
 Wat Sol (Exper. database match) = 16800.00
 Exper. Ref: YALKOWSKY,SH & DANNENFELSER,RM (1992)

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

 Henrys Law Constant (25 deg C) [HENRYWIN v3.10]:
 Bond Method : 1.72E-009 atm-m3/mole
 Group Method: Incomplete
 Henrys LC [VP/WSol estimate using EPI values]: 5.029E-015 atm-m3/mole

 Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
 Log Kow used: -2.83 (KowWin est)
 Log Kaw used: -7.153 (HenryWin est)
 Log Koa (KOAWIN v1.10 estimate): 4.323
 Log Koa (experimental database): None

 Probability of Rapid Biodegradation (BIOWIN v4.10):
 Biowin1 (Linear Model) : 1.1135
 Biowin2 (Non-Linear Model) : 0.9989
 Expert Survey Biodegradation Results:
 Biowin3 (Ultimate Survey Model): 2.8386 (weeks )
 Biowin4 (Primary Survey Model) : 4.0940 (days )
 MITI Biodegradation Probability:
 Biowin5 (MITI Linear Model) : 0.6654
 Biowin6 (MITI Non-Linear Model): 0.8140
 Anaerobic Biodegradation Probability:
 Biowin7 (Anaerobic Linear Model): -0.5397
 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): 0.00745 Pa (5.59E-005 mm Hg)
 Log Koa (Koawin est ): 4.323
 Kp (particle/gas partition coef. (m3/ug)):
 Mackay model : 0.000403 
 Octanol/air (Koa) model: 5.16E-009 
 Fraction sorbed to airborne particulates (phi):
 Junge-Pankow model : 0.0143 
 Mackay model : 0.0312 
 Octanol/air (Koa) model: 4.13E-007 

 Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
 Hydroxyl Radicals Reaction:
 OVERALL OH Rate Constant = 16.7441 E-12 cm3/molecule-sec
 Half-Life = 0.639 Days (12-hr day; 1.5E6 OH/cm3)
 Half-Life = 7.665 Hrs
 Ozone Reaction:
 No Ozone Reaction Estimation
 Fraction sorbed to airborne particulates (phi): 0.0228 (Junge,Mackay)
 Note: the sorbed fraction may be resistant to atmospheric oxidation

 Soil Adsorption Coefficient (PCKOCWIN v1.66):
 Koc : 5.844
 Log Koc: 0.767 

 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 = 0.500 (BCF = 3.162)
 log Kow used: -2.83 (estimated)

 Volatilization from Water:
 Henry LC: 1.72E-009 atm-m3/mole (estimated by Bond SAR Method)
 Half-Life from Model River: 3.636E+005 hours (1.515E+004 days)
 Half-Life from Model Lake : 3.967E+006 hours (1.653E+005 days)

 Removal In Wastewater Treatment:
 Total removal: 1.85 percent
 Total biodegradation: 0.09 percent
 Total sludge adsorption: 1.75 percent
 Total to Air: 0.00 percent
 (using 10000 hr Bio P,A,S)

 Level III Fugacity Model:
 Mass Amount Half-Life Emissions
 (percent) (hr) (kg/hr)
 Air 0.0964 15.3 1000 
 Water 39.4 360 1000 
 Soil 60.4 720 1000 
 Sediment 0.0721 3.24e+003 0 
 Persistence Time: 559 hr




 

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