Dear Biswajit,

Silanols such as Et3SiOH and (3-ClC6H4)Si(CH3)2OH are acidic compounds with pka values of  13.6  and 11, respectively.  Because of their greater acidity, silanols can be fully deprotonated in aqueous solution, especially the arylsilanols. The conjugate base is called a siloxide or a silanoate.

Since your amine is aryl amine (aniline derivatives), it might not be able to deprotonate the silanol since this amine is a very weak base. However, if you use an aryl amine derivative with a fairly good basicity you may be able to deprotonate the silanol. Other than the deprotonation reaction, no other reactions are expected to take place between R3Si-OH and Ar-NH2.

Beckmann, J.; Dakternieks, D.; Duthie, A.; Larchin, M. L.; Tiekink, E. R. T.: Tert-butoxysilanols as model compounds for labile key intermediates of the sol-gel process: crystal and molecular structures of (t-BuO)3SiOH and HO[(t-BuO)2SiO]2H, Appl. Organomet. Chem. 2003, 17, 52–62.

Hoping this will be helpful,

Rafik

Dear Biswajit,

An abstract of paper on: Role of Amines in Adhesion of Polybutadiene to Glass Substrates. II. Reactions of Amines with Trimethoxysilanol and/or Fumed Silica. The Journal of Adhesion Volume 15, Issue 2, 1983. PreviewPDF Access optionsDOI:10.1080/00218468308073224

Y. Ecksteinab & P. Dreyfussapages 163-178.

Abstract

This paper is part of a larger investigation of the role of amines in the adhesion of polybutadiene to glass substrates. It describes near infrared, infrared and nuclear magnetic resonance spectroscopy studies of the interaction of amines with silanol groups usually under ambient conditions but sometimes when heated in air. Additional supporting evidence was obtained from gas liquid chromatography, mass spectrometry and elemental analyses. In order to assure a sufficiently high concentration of silanol groups, triethylsilanol and fused silica were used as models for the glass surface. The mechanism of interaction of aliphatic amines and of the aminosilane was different from that of aromatic amines. Most notably, reaction of aliphatic amines with carbon dioxide in the air and/or dissolved/adsorbed in/on the silanol occurred almost instantaneously, whereas the corresponding reaction of the aromatic amines with carbon dioxide was not observed under the experimental conditions used. The carbamates formed underwent further reactions much more rapidly than either the simple aromatic amines or the unmodified aliphatic amines.May give the answer.

Best wishes

Dear Talaat,

The example paper you give does not report a direct reaction of aryl amine with Silanol. The reaction happens via the incorporation of CO2 to form the corresponding carbamat. No direct reaction between aryl amine and Silanols was documented. 

Rafik

Dear Anwar,

They are weak acids (pka about 11-14), but in comparisons to the corresponding alcohols they are considered as stronger acids.

Rafik

Dear Rafik

The abstract that i provided  describes near infrared, infrared and nuclear magnetic resonance spectroscopy studies of the interaction of amines with silanol groups usually under ambient conditions but sometimes when heated in air.

Thank you very much for your valuable notification.

Dear all friends

Please, find in attach  A Guide to Silane Solutions, The Basics of Silane Chemistry.

Best regards

 Thank you all for your suggestions. My actual aim is to react mesoporous silica with melamine.. Now what are the methods available.. 

Dear Biswajit Bera

Please, find in attach an Electronic Supplementary Material (ESI) for RSC Advances.

This journal is © The Royal Society of Chemistry 2014. Large-scale synthesis of mesoporous carbon microspheres with controllable structure and nitrogen doping using a spray drying method. Xu Li, Jianguo Zhou, Jitongwang, Wenming Qiao, Licheng Ling and

Donghui Long*.state Key Laboratory of Chemical Engineering, East China University of

Science and Technology, Shanghai, China.

1. Experimental details

1.1 Materials and reagents

Rresorcinol (99.5%, Sinopharm Chemical), formaldehyde (37-40%, Sinopharm

Chemical), silica sols (Ludox SM-30, Ludox HS-40, Ludox TM-40, Sigma-Aldrich),

sodium hydroxide (96%, Sinopharm Chemical), Vitamin B12 (98%, Sigma-Aldrich),

melamine (99%, Sinopharm Chemical) were all used without any further purification.

1.2 Preparation of MCMSs

The resorcinol and formaldehyde were added into the silica sols with continuous

magnetic stirring, after which the sol was further diluted with distilled water to the

desired content (%w/v). The mole ratio of resorcinol/formaldehyde was fixed at 2 and

the weight ratio of resorcinol-formaldehyde/SiO2 was adjusted to 0.5, 0.75, 1.0,

respectively. The mixed sol was stirred for 1 h at 40 °C, and then spray-dried using a

spray-dryer (Blon-6000y, Shanghai Bilon Instrument Co., Ltd). The solution was

pumped into the nozzle at the rate of 500-1000 ml/h, together with a constant spray air

flow. The liquid was atomized into fine droplets at a constant pressure of 0.3 MPa.

The inlet temperature was set to 120 °C, generally the outlet temperature was in the

range of 58-65 °C. Fine powder was discharged continuously from the drying

chamber and then collected using a cyclone separator. The powder was then

carbonized in a nitrogen flow at 800 °C for 3 h with a heating rate of 5 °C min−1.

Finally, the MCMSs were obtained by the dissolution of silica nanoparticles in 2 M

NaOH solution at 80 °C, isolated by filtration, washed with distilled water and ethanol,

and dried at 100 °C.

Nitrogen-doped MCMSs were obtained by adding melamine into resorcinolformaldehyde

solution. Melamine and formaldehyde with the mole ratio of 1:2 were

dissolved in 50 ml of distilled water at 80 oC with consecutive agitation until the

solution became clear. The solution was cooled down to 40 oC, and then resorcinol

and formaldehyde were added with continuous magnetic stirring. The above solution

was mixed with the silica sol and further diluted with distilled water to the desired

content. The mole ratio of melamine/ resorcinol was changed from 0 to 1 and the

weight ratio of resorcinol-melamine-formaldehyde/SiO2 was adjusted to 0.75. The

spray conditions and carbonization, silica removal procedures were same with these

of MCMSs.

Best wishes

Thank you sir