I am trying to conjugate two materials having both carboxylic group. Is there any available method or intermediate for effective conjugation. Many thanks for your kind suggestions.
It is a bit hard to give sound suggestions without more contect on the material's structure. Assuming that by "carboxylic groups" you mean carboxylic acids, you could do a diamine (e.g. ethylenediamine) coupling, which is a very standard reaction, many protocols available and the reagents (if well chosen) are not too hazardous. See attached pdf.
Samuel Núñez-Pertíñez I mean that two materials contain -COOH group, so I want to find coupling agents or intermediate can conjugate them together. Thank you for your kind suggestion.