What question did this study set out to answer?

The study aims to explore the self-aggregation behavior of synthetic bacteriochlorophyll-d analogs bearing a POSS unit.

January 22, 2026Open Access

Self-aggregation of synthetic bacteriochlorophyll- d analogs with a heptaisobutylated pentacyclooctasiloxane (POSS) moiety in single-alkane solvents

SSSunao Shoji HIHiyori IdeiRitsumeikan University TNTakeo NakanoRitsumeikan University

Key Points

The study aims to explore the self-aggregation behavior of synthetic bacteriochlorophyll-d analogs bearing a POSS unit.
Synthesis of bacteriochlorophyll-d analogs with POSS moiety
Observation of self-aggregation in n-decane and mixed solvents
Temperature-dependent stability measurements
Analog derivatives formed J-aggregates when refluxed in n-decane
J-aggregates were also observed in tetrahydrofuran–n-hexane systems
The amide-type analog showed superior thermal stability compared to the ester-type.

Abstract

Abstract Novel bacteriochlorophyll-d analogs bearing a highly hydrophobic Polyhedral Oligomeric SilSesquioxane (POSS) unit linked by an ester or an amide bond on the 17-position were synthesized, and their chlorosomal self-aggregation behavior was demonstrated in single-alkane solvents. Both derivatives formed J-aggregates after refluxing in neat n-decane, similar to those obtained in tetrahydrofuran–n-hexane mixed-solvent systems. Temperature-dependent measurements revealed superior thermal stability for the amide-type analog, highlighting the crucial role of the 17-substituent design in controlling chlorosomal self-aggregation.

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