TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The second compound is an alkoxy silane compound. The second compound is organic compound that lacks an alkoxy silane group. The first organofunctional group is an alkoxy silane compound having amine functionality. The second organofunctional group comprises epoxy functionality. The porous coating has an average pore size of less than 50 nm, 45 nm, 40 nm, 35 nm, 30 nm, 25 nm, 20 nm, 15 nm, 10 nm, or 5 nm. The porous coating has a refractive index of 1.22-1.38. The inorganic substrate is light transmissive and the presence of the porous coating increases the transmission of the inorganic substrate by at least 1.5% over a wavelength of 380-1100. The substrate is glass and the heating concurrently tempers the glass. The porous inorganic surface layer further comprises alumina. The coating comprises siloxane nanoparticles of formula ((R4O)mSiR5-L1-(L2-R5-Si-(O-R4)m)p) (I) or ((R4O)mSi-R5-L1)pL2) (II).R4 = H or silicon atom of siloxane segment;R5 = alkylene, arylene, or alkarylene;m, p = 1-3; andL1, L2- = reaction product of the first and second organofunctional groups, preferably L1-L2- comprises C or N.The siloxane nanoparticles have an elongated linear structure or a branched structure. The dried coating composition comprises 0.5-10 wt.% nitrogen. The coating composition further comprises siloxane particles of formula (R2Si(OR4)m).R2 = H, R1, or OR1.The coating composition further comprises an aluminum salt, optionally in combination with an organophosphorus compound. The substrate is light transmissive, inorganic material, glass. The second compound is substituted silane compound of formula ((R1O)mSi(R5Y1)4-m).R1 = alkyl;R5 = alkylene, arylene, or alkarylene; andY1 = epoxide terminal group.The second compound is an epoxy compound lacking an epoxy silane group. EXAMPLE - Coating solution was prepared by first adding to 237 ml glass jar 35 g isopropanol and 60 g 1-methoxy-2-propanol. To the solution was added 3.5 g of a mixture of 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane and (3-aminopropyl)trimethoxysilane (APS) at 62:38 weight ratio (1:1 molar ratio) and 1.5 g tetraethoxyl silane (TEOS). The weight ratio of 2-(3,4-epoxycyclohexyl)ethyltriethoxysilane/APS:TEOS was 70/30. These was followed by the addition of 2g of distilled water and a couple of drops of acetic acid. The clear mixture solution was stirred overnight at 70 degrees C ( 16 hrs).