Square-planar Pd(II) is retained on converting cis-[Pd(NH₃)₂Br₂] to [Pd(β-ala)Br₂]⁻, where β-ala⁻ = H₂NCH₂CH₂COO⁻ chelates through N,O. Consider (i) coordination number, (ii) EAN, (iii) number of geom

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Square-planar Pd(II) is retained on converting cis-[Pd(NH₃)₂Br₂] to [Pd(β-ala)Br₂]⁻, where β-ala⁻ = H₂NCH₂CH₂COO⁻ chelates through N,O. Consider (i) coordination number, (ii) EAN, (iii) number of geometrical forms for the indicated donor connectivity, (iv) Pd−N bond count. Which remain unchanged?

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Both have Pd(II), four donors and EAN 46−2+8 = 52. The starting Ma₂b₂ composition has cis/trans forms; a single N,O-chelate with two Br ligands has one form. Pd−N bonds decrease from two to one. The chelate occupies adjacent sites even though its ring has six members.

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