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Focuses are twofold, to see the (1) impacts of metamerism with Reichardt\u2019s vs Brooker\u2019s types of zwitterions and (2) impacts of monocyclic aromatic rings as bridges. All the molecules considered here have pyridinium (common acceptor: A) and <jats:italic>p<\/jats:italic>-phenylene-dicyanomethanide (common donor: D). Fundamental molecular properties like dipole moments (<jats:italic>\u03bc<\/jats:italic>), polarizabilities (<jats:italic>\u03b1<\/jats:italic>), hyperpolarizabilities (<jats:italic>\u03b2<\/jats:italic>), and adiabatic absorptions were computed only for the Reichardt types and compared with the literature reported respective Brooker\u2019s types of zwitterions. As an impact of metamerism, in general 2\u20133 times enhanced hyperpolarizabilities (<jats:italic>\u03b2<\/jats:italic>) were observed for Reichardt\u2019s compared to Brooker\u2019s types. Exceptions were observed with some triazine bridges and furan bridge, where Brooker\u2019s types were found to be more efficient. As impacts of aromatic bridges, in general, 6\u2013sevenfold enhanced <jats:italic>\u03b2<\/jats:italic> compared to well-known traditional bridges and enhanced <jats:italic>\u03b2<\/jats:italic> were observed compared to D-A directly connected zwitterion (benzene bridge: sixfold enhanced <jats:italic>\u03b2<\/jats:italic>). Current findings show that the aromatic bridge control with Reichardt\u2019s types of zwitterions is more efficient and thus may be employed as an effective strategy for the designing of functional molecular chromophores for various other fundamental areas.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>All computations were performed with Gaussian 09. Geometry optimizations and computations of fundamental properties were carried out with HF, B3LYP, CAM-B3LYP, and \u03c9B97xD methodologies, with 6-31G(d,p) and aug-cc-pVDZ basis sets. For adiabatic excitations, computations were carried out using TDDFT and TDHF approaches. For the computations of the response properties (like the nonlinear optical responses), CPHF approach was used.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1007\/s00894-024-06055-3","type":"journal-article","created":{"date-parts":[[2024,7,26]],"date-time":"2024-07-26T22:01:50Z","timestamp":1722031310000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Enhanced molecular first hyperpolarizabilities with Reichardt\u2019s type of zwitterions: a computational study on roles of various monocyclic aromatic bridges"],"prefix":"10.1007","volume":"30","author":[{"given":"Divya","family":"Pant","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sanyasi","family":"Sitha","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,7,26]]},"reference":[{"key":"6055_CR1","doi-asserted-by":"crossref","first-page":"e4569","DOI":"10.1002\/poc.4569","volume":"37","author":"D Pant","year":"2024","unstructured":"Pant D, Sitha S (2024) Metameric Brooker\u2019s vs Reichardt\u2019s zwitterions: conformational metamorphosis on optoelectronic properties, using coupled-perturbed and finite field theories. 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