Key indicators: single-crystal X-ray study; T = 120 K; mean (C-C) = 0.015 Å; R factor = 0.096; wR factor = 0.149; data-to-parameter ratio = 17.2.The title compound, C 6 H 13 N 2 + ÁC 20 H 7 Br 4 O 5 À , is a molecular salt of singly protonated 1,4-diazabicyclo[2.2.2]octane and the eosinide monoanion. Contrary to a handful of previous crystal structures which contain eosin in its dianionic form, here, the carboxyl group of the anion has retained its H atom. The dihedral angle between the triple ring system and the pendant benzene ring in the anion is 86.0 (2) . In the crystal structure, the components interact by way of a bifurcated N-HÁ Á Á(O,Br) hydrogen bond linking cation and anion, and an O-HÁ Á ÁO hydrogen bond which links the anions into infinite chains propagating in [001].

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The title compound, C6H14N22+·2C7H4NO4−·2.17H2O, is a hydrated molecular salt. The cation has crystallographic twofold rotation symmetry, and the component species interact by way of bifurcated N—H...(O, N) hydrogen bonds to result in associations of two anions and one cation. The anion is stabilized by an intramolecular O—H...O bond. The water molecules are disordered and occupy [001] pseudo channels in the structure.

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The plant diseases have significant role in agriculture in terms of reduction in yield and economy. In agriculture, for thousands of years, people have been using neem oil as a natural insecticide, fungicide and bactericide. Neem pesticides have been widely used to kill or manage the population of pest. Neem oil is hydrophobic in nature; in order to emulsify it in water for application purpose, it must be formulated with appropriate surfactants. In the present study, neem oil was mixed with sodium dodecyl sulphate (SDS). The density, viscosity and ultrasonic velocity of aqueous solutions of SDS with neem oil have been measured. The compressibility behaviour of solutions provides very useful information related to solute and solvent interactions. The solubility of neem oil has been investigated by the estimated values of solvation parameters. The experimental data have been used to calculate the solvation parameters such as adiabatic compressibility, molal hydration number, apparent molal compressibility, apparent molal volume, limiting apparent molal compressibility, limiting apparent molal volume and their constants and viscosity co-efficients A and B of Jones equation. Based on the results, the nature and types of interactions in the solutions are discussed. The growth performance of cowpea crop in pot culture experiment is also analysed. After manifestation, periodical records of symptoms of diseases due to insects are noted. The biometric observations of crops at frequent intervals are enumerated. The results obtained from ultrasonic method and pot culture experiment are in consonant with each other. @ IJTSRD | Available Online @ www.ijtsrd.com | Volume -2 | Issue -1 |

In the title compound, C11H13Cl2NO, the chloroethyl amino groups are twisted with respect to the amino group, with N—C—C—Cl torsion angles of −177.4 (4) and 179.2 (3)°. The carbonyl group lies in the plane of the benzene ring to which it is attached; torsion angles Car—Car—C=O are 0.1 (8) and −178.2 (5)°. In the crystal, C—H...Cl and C—H...O hydrogen bonds link the molecules, forming sheets parallel to (20-1). The sheets are linked by C—H...π interactions, forming a three-dimensional framework.