Meta-Dinitrobenzene

Chemical Designations - Synonyms 1,3-Dinitrobenzene 1,3-Dinitrobenzol —DNB meta-Dinitrobenzene Dinitrobenzol Chemical Formula 1,3-C4H4(N02)2. 

Securite. A Dynamite which used to be manufd at Dinamitificio di Segni NG 52 30 and NC 48 70% (Ref 1, p 298). Belgrano (Ref 31, p 317) lists another Securite consisting of AN m-DNBz (meta-Dinitrobenzene)... 

E. Adducts from meta-Dinitrobenzenes 1. With allcoxides... 

Ort/io-bromonitrobenzene as well as ortho- and meta-dinitrobenzenes form isostructural compounds of this type, Zn(NCS)2(4-methylpyridine)4 and Cu(NCS)2(4-methylpyridine)4 (host) complexes with a variety of guest molecules are known as well. 

Low and high are relative to the guest species, meta-bromonitrobenzene shows the transition at about 60°C, while meta-dinitrobenzene shows transition of this sort at about 95°C. Description is somewhat simplified here. The ordered guest molecules shown on the picture still have some 10-15 % of disordering over two different orientations. This, however, is qualitatively different from the symmetric disordering around the threefold axis. 

Surface acidity and basicity were measured by adsorption of organic bases such as pyridine (PY, pk,=5.3), morpholine (MP, pk, = 8.33), piperidine (PP, pk, = 11.1) and acidic substrates like acrylic acid (AA, pk = 4.2), phenol (PH, pk, = 9.9), respectively by spectrophotometric method[15,16]. Redox properties (one electron donor and one electron acceptor) were determined by the same method using meta dinitrobenzene (DNB, electron affinity, EA = 2.21eV) and phenothiazine (PNTZ, ionisation energy, IE = 7.13eV) as the adsorbates. 

Meta-dinitrobenzene has a large dipole moment (p = 4.29 D), very close to that of nitrobenzene, and a quadrupole moment of Q = - -18 a.u. Its parallel and perpendicular polarizabilities are estimated to be 21.2 and 17 A, respectively. From the electrostatic model, the predicted electron affinity of mDNB is 105 25 meV, corresponding to a peak in the RET curve at around n = 7. The curve for mDNB (not shown) is very different from the RET curve corresponding to pDNB. The broad peak at = 11-12 is not present and is replaced by a very small peak at = 8, close to the predicted value for the dipole-bound mDNB anion. The anions reported here are not observed to undergo field detachment. Again, this observation is attributed to the coupling of these diffuse states with the ground valence anion state. 

Synonyms/Trade Names meta-Dinitrobenzene 1,3-Dinitrobenzene... 

Synonyms 1,3-Dinitrobenzene 1,3-Dinitrobenzol m-DNB meta-Dinitrobenzene Dinitrobenzol Chemical Formula 1,3-C H (N02)2 IH) Observable Characteristics — Physical State (as normally shipped) Solid Color Yellow Odor Weak (iii) Physical and Chemical Properties — Physical State at 15 °C and I atm. Solid Molecular Weight 168.1 Boiling Point at I atm. 556, 291,564 Freezing Point 194, 90, 363 Critical Temperature Not pertinent Critical Pressure Not pertinent Specific Gravity 1,58 at 18°C (solid) Vapor (Gas) Density Not pertinent Ratio of Specific Heats of Vapor... 

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