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Inside a four-molecule stack, red light pushed charge from a donor toward a final acceptor through a connected bridge.<\/p>\n
Working at Julius-Maximilians-Universit\u00e4t W\u00fcrzburg (JMU<\/a>) doctoral researcher Leander Ernst demonstrated that the electron advanced through each unit in sequence rather than leaping across the entire structure.<\/p>\n As the stack<\/a> length increased, the charge continued moving along the same path instead of stopping early or collapsing back.<\/p>\n That continuity depended on how the molecules were arranged, which sets limits on when the relay can complete or stall.<\/p>\n Molecules guide charge<\/p>\n Chemists chose perylene bisimide (PBI<\/a>), a durable dye family for electronics. One outer unit absorbed redder light than the others, so the team could start the relay from a chosen end.<\/p>\n Another outer unit pulled electrons more strongly, which created an energy downhill path instead of a dead end.<\/p>\n \u201cWe can specifically trigger the charge transport in this structure with light and have analysed it in detail,\u201d said Ernst.<\/p>\n Early evidence of relay<\/p>\n Red light<\/a> hit the starting part of the molecule, and most of the usual glow quickly faded away.<\/p>\n In a simple liquid called toluene, the light dropped from about one in five flashes to almost none in the shortest version.<\/p>\n Longer versions still gave off only faint light, which showed the energy was moving away instead of shining back out.<\/p>\n That drop in brightness signaled that the energy had found a faster path, traveling through the structure rather than being released as light.<\/p>\n Solvent changes everything<\/p>\n In toluene, the moving charge reached the middle of the structure<\/a> but often stopped before finishing the journey.<\/p>\n In a different kind of liquid where charges are easier to stabilize, the final step became easier to complete.<\/p>\n That change let the charge keep moving, so it could travel all the way to the end instead of getting stuck halfway.<\/p>\n Without that help from the surrounding liquid, the charge often slipped backward and stayed near where it began.<\/p>\n Distance reveals route<\/p>\n A key measure showed how well the charge kept moving as the distance increased.<\/p>\n In this system, the signal weakened only slightly as the path grew longer, far less than expected for a single jump.<\/p>\n That pattern pointed to a step-by-step motion, where the charge moved through the structure in small hops between neighbors.<\/p>\n Because of that steady movement, the stacked molecules behaved more like a tiny wire than a fragile, one-time pathway.<\/p>\n Inspired by plant energy<\/p>\n In natural photosynthesis<\/a>, plants also protect useful energy by moving charge apart before it can recombine.<\/p>\n Artificial versions need that same trick, because separated charge can later drive fuel-making chemistry instead of disappearing as wasted heat.<\/p>\n The new PBI arrays copied that early handoff with unusual control, even though they remain far simpler than a cell.<\/p>\n That simplicity is useful because chemists can change one piece at a time and see what the redesign actually does.<\/p>\n Why speed counts<\/p>\n Fast forward motion matters because electrons that linger can fall back and erase the separation that devices need.<\/p>\n In the longest stack, the charge reached its final state in about 1,100 trillionths of a second in the polar solvent.<\/p>\n That slower second leg still followed an ultrafast first move<\/a>, which happened in about one trillionth of a second.<\/p>\n Because recombination slowed as the arrays grew longer, the design gained more breathing room for useful work afterward.<\/p>\n Current limits of design<\/p>\n Even here, the system did not behave like a perfect molecular wire under every condition.<\/p>\n Nonpolar surroundings stopped the last step, and the longest transfer still lost speed as the distance increased.<\/p>\n Stronger acceptor units or a slightly different overlap between neighbors could pull the charge farther and faster next time.<\/p>\n That is why the JMU team now wants longer stacks, aiming for a wire made from linked molecules.<\/p>\n Applications in electronics<\/p>\n Better molecular routing could help chemists build thinner solar materials that waste less absorbed light before work begins.<\/p>\n The same control may also matter in sensors, photodetectors, and organic circuits that depend on directed charge motion.<\/p>\n Because the PBI stack works through close contact instead of a long rigid bond, designers gain another way to tune performance.<\/p>\n That added design freedom could make future materials more adaptable, especially when one recipe fails under real operating conditions.<\/p>\n Why this matters<\/p>\n A four-dye stack shows that carefully spaced molecules can pass charge along by fast, stepwise motion rather than a single long jump.<\/p>\n That makes the chemistry more than a lab curiosity, while leaving clear engineering problems for longer, tougher, and more selective systems.<\/p>\n The study is published in Nature Chemistry<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read?\u00a0Subscribe to our newsletter<\/a>\u00a0for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on\u00a0EarthSnap<\/a>, a free app brought to you by\u00a0Eric Ralls<\/a>\u00a0and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Researchers have found that electrons can move step by step across a stack of dye molecules within trillionths…\n","protected":false},"author":2,"featured_media":553951,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[49,48,66],"class_list":["post-553950","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-ca","tag-canada","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/553950","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/comments?post=553950"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/553950\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media\/553951"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media?parent=553950"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/categories?post=553950"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/tags?post=553950"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}