NOVELTY - Dianion of doubly reduced perylene-diimide compounds or their metal complex are new.    USE - For coating nanoparticles comprising silica or titanium or in a organic light emitting diode (OLED) (claimed); as industrial dyes, electronic materials, sensors, photovoltaics, supercacitors, and building blocks for light-harvesting and artificial photosynthetic systems; in electroluminescence field e.g. blue-light OLED; as molecular switching components for non linear optics, in molecular-based computational systems in filed-effect transistors (FET), in negative differential resistance (NDR) semiconductors; and in organic electronic device e.g. organic and polymeric light emitting diodes (OLEDs, PLEDs), organic field-effect transistors (O-FETs), organic thin film transistors (O-TFTs), organic light emitting transistors (O-LETs), organic integrated circuits (O-ICs), organic solar cells (O-SCs), organic field quench devices (O-FQDs) or organic laser diodes (O-Laser).    ADVANTAGE - The compound provides new electronic properties; absorbs visible light and reach highly energetic excited states, allowing access to high energy electron transfer reactions; allows easy transfer of more electronics with respect to similar compounds, thus obtain anionic species usable as molecular magnets; and is applied in the form of thin film or coating upon a proper substrate (metallic or non metallic).    DETAILED DESCRIPTION - Dianion of doubly reduced perylene-diimide compounds of formulae (I)-(III) or their metal complexes are new.    X=-NR1;    Y1=-NR2;    R1=(hetero)aryl (optionally mono- to tri-substituted by T1), ((CH2)nO)oCH3, ((CH2)nC(O)O)oCH3, ((CH2)nC(O)NH)oCH3, ((CH2)nCH2=CH2)oCH3, ((CH2)nCH?=CH)oCH3, ((CH2)nNH)oCH3, (1-32C)alkyl, (3-8C)cycloalkyl, (1-32C)alkyl-COOH, (1-32C)alkyl-Si-A or (C(O)CHR3NH)pH;    T1=halide, CN, CO2H, OH, SH, NH2, CO2-(1-6C alkyl) or O-(1-6C alkyl);    A=three substituents of Cl, Br, I, O(1-8C)alkyl or (1-8C)alkyl;    R2=(hetero)aryl (optionally mono- to tri-substituted by T1), ((CH2)qO)rCH3, ((CH2)qC(O)O)rCH3, ((CH2)qC(O)NH)rCH3, ((CH2)qCH2=CH2)rCH3, ((CH2)qCH?=CH)rCH3, ((CH2)qNH)rCH3, (1-32C)alkyl, (3-8C)cycloalkyl, (1-32C)alkyl-COOH, (1-32C)alkyl-Si-A, or (C(O)CHR4NH)sH;    R3=(hetero)aryl or ((hetero)aryl)alkyl (both optionally mono- to tri-substituted by T1), H or T2;    T2=(1-6C)alkyl, (1-6C)hydroxyalkyl, (1-6C)mercaptoalkyl, (1-6C)aminoalkyl, (1-6C)carboxyalkyl, (1-6C)carboxamidoalkyl or (1-6C)guanidinoalkyl;    R4=(hetero)aryl or ((hetero)aryl)alkyl (both optionally mono- to tri-substituted by T1), H or T2;    R5,R6=H, (hetero)aryl, or optionally saturated carbocyclic or heterocyclic ring (where the saturated heterocyclic ring or heteroaryl contains at least one nitrogen atom) (both optionally mono- to tri-substituted by T1), C?=C-R7, CH=CR8R9 or NR10R11;    R7=(hetero)aryl (optionally mono- to tri-substituted by T1), H, halo, (1-32C)alkyl, Si(H)3 or Si((1-8C)alkyl)3;    R8-R11=(hetero)aryl (optionally mono- to tri-substituted by T1), H or (1-32C)alkyl;    n=1-5;    o,p,o1=1-100;    q=2-5;    r,s=1-100;    R5a=R5 or -ORx;    Rx=1-6C alkyl or ((CH2)n1O)o1CH3;    L1=unsaturated linker;    P1=perylene-diimide group or (hetero)aryl (optionally mono- to tri-substituted by T1) (preferably group of formula (ia) or (ib)).    Provided that R3 is same or different in (C(O)CHR3NH)pH, when p is larger than 1; R4 is same or different in (C(O)CHR4NH)sH, when s is larger than 1; and R4 and R5 are connected via the nitrogen atom. INDEPENDENT CLAIMS are included for the following:    (1) a supramolecular polymer comprising a monomer unit of formula (VIa) or (VIb); and    (2) preparation of the compound (I)-(III).