## 1 Introduction  
Water-based inkjet inks are widely used in inkjet printing fields, including flexible packaging and textiles [1, 2]. High-performance, high-quality water-based inkjet inks are critical for the development of inkjet printing technology, imposing higher requirements on the long-term stable dispersion of organic pigments in water [3]. Unfortunately, due to the hydrophobicity of organic pigments and intermolecular forces (including van der Waals forces, \(\pi\)-\(\pi\) stackings, H-bonds), pigment particles aggregate severely in water, which poses a major obstacle to the development of high-quality inks [4, 5]. Therefore, it is necessary to add pigment dispersants, including surfactants, polymers, and coupling agents [6, 7, 8]. Among them, polymers are more effective in reducing the degree of aggregation of pigment particles through adsorption and steric hindrance effects. Additionally, the hydrophilicityand hydrophobicity of polymers can be adjusted by modifying the structure and content of the monomers. This property facilitates a balance between affinity for pigments and that for the dispersion medium [9]. Consequently, polymeric dispersants have been widely studied and applied. Water-soluble polymers can serve as dispersants, including polyurethane (PU), polyacrylic acid (PAA), polyvinyl alcohol (PVA) and their derivatives, as well as polyelectrolytes [10; 11; 12]. These dispersants primarily adsorb onto pigments through classical H-bonds or electrostatic interactions. However, these interactions result in inadequate dispersion for pigments with intermolecular forces of \(\pi\)-\(\pi\) stackings. Worse still, the robust interactions among chain segments result in high viscosity at elevated contents, posing a formidable obstacle for their use as inkjet ink dispersants. Hyperbranched polymers with low viscosity have been synthesized to address this issue, including hyperbranched polyurethane, hyperbranched polyester, and hyperbranched polyacrylic acid [13; 14; 15]. However, this may bring about new challenges due to their lower hydrophilicity and poorer stability. In recent years, significant progress has been made in water-dispersible type dispersants, including styrene-maleic anhydride copolymers, styrene-acrylate copolymers and their derivatives, as well as block polymers and comb-like polymers with multiple functional groups (such as heterocyclic, alkyl, alkoxy, polyalkoxy, arylalkyl, etc.) [16; 17; 18; 19; 20; 21; 22]. However, most water-dispersible dispersants are synthesized using controlled polymerization technology (CPT), which is costly and involves complex synthesis processes. Furthermore, these dispersants primarily adsorb onto pigments through \(\pi\)-\(\pi\) interactions, thereby exhibiting an incapacity to interact effectively with pigments exhibiting intermolecular forces of H-bonds. Despite the development of many polymeric dispersants, most of these dispersants have complex synthesis processes, relatively weak interactions with pigments, and a limited range of applicable pigment types. These challenges greatly restrict the application of polymeric dispersants in inkjet inks. Currently, few dispersants have been reported to be universal for the stable dispersion of organic pigments with different types of intermolecular forces, let alone dispersants that form stronger interactions with pigments (such as salt-bridge H-bonds [23]). Undoubtedly, it is highly promising in industrial applications to develop hydrophilic dispersants that interact strongly with pigments and have universal applicability. Herein, we initially designed anion-\(\pi\) type PNPs by capitalizing on salt-bridge H-bonds and \(\pi\)-\(\pi\) interactions. This strategy remarkably enhanced the dispersion stability of organic pigments with diverse intermolecular forces in water.