TECHNOLOGY FOCUS - ELECTRONICS - Preferred Material: The material comprises at least 5, optionally fused, aromatic moieties.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation of compound (I') is given in the specification. Preferred Compounds: The compound (I') comprises at least one moiety of formula -R'o-P(O)(OH)2 (XIV).R'=1-40C group;o=0 to 1. Preferred Definitions:    R'1=aromatic moieties comprising six-membered carbon rings;    R2=aromatic moiety of formula -phenyl (substituted on 1-position by R9, on 2-position by R4, on 3-position by R6, on 4-position by R8, on 5-position by R7 and on 6-position by R5) (XIII);    R4 and R5=H, a halogen atom, 1-40C group, or a group comprising at least one phosphonic acid moiety;    R6-R8=R4 (preferably a group comprising at least one phosphonic acid moiety);    R9=a bond, alkylene, alkenyl, alkynyl or cycloalkylene.    The R'1 has 3C or 6C symmetry. The phosphonic acid moieties form a 3 dimensional lattice. Provided that at least one of the R4-R8 is group comprising at least one phosphonic acid moiety.    SPECIFIC COMPOUNDS - 20 Compounds are disclosed as proton-conducting compound (I') e.g. (P,P'-(1,1',4',1''-terphenyl)-4,4''-diyl)bisphosphonic acid, 1,3,5-tris(para-phosphonatophenyl)-benzene of formula (Ia), 1,3,5,7-tetra(para-phosphonatophenyl)-adamantane, and hexaquis(para-phosphonatophenyl)benzene.    EXAMPLE - 4,4'-Diiodo-para-terphenyl (0.48 g) was dissolved in anhydrous toluene (100 ml) and stirred under argon until it was dissolved. Diethyl phosphite (0.56 g) and triethylamine (0.41 g) were added with a syringe, and the mixture was stirred for additional 10 minutes, finally with high argon purge tetrakis(triphenyl phosphine)palladium (0.2918 g) was added and the mixture was heated at 80-90 degrees C during the night (12 hours). After cooling to room temperature diethyl ether was added to the reaction mixture to precipitate the triethylamine hydroiodide, which was removed by filtration. After work up, 4,4'-diethylphosphonato-para-terphenyl was obtained. 4,4'-Diethylphosphonato-para-terphenyl (0.486 g) was treated with TMS-Br (1.209 g) in 150 ml of DCM for 48 hours (first step). Then, DCM was evaporated and the product of the first step dried under vacuum. The product of the first step was treated with MeOH (200 ml) for another 48 hours. After work up, (P,P'-(1,1',4',1''-terphenyl)-4,4''-diyl)bisphosphonic acid (yield first step: 68%; yield second step: 72%) was obtained.